Agency Profile

Coi Rubber Products

Coi Rubber Products, United States

Primary Address

, Coi Rubber Products, CA , United States 91765

Coi Rubber Products

Services

  • Manufacturing

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Overview

Coi Rubber Products, Inc. is a U.S.-based rubber manufacturing and distribution company headquartered in Diamond Bar, California, with operations and production capabilities extending into Asia, including China. Founded on a vision of engineering precision and service excellence, the company specializes in custom rubber molding, extrusion, and sealing solutions for the automotive, industrial, and OEM sectors. With over a decade of steady growth, Coi Rubber has evolved from a niche importer into a vertically integrated manufacturer offering full-spectrum rubber product design, prototyping, tooling, and mass production. The company’s strengths lie in its ability to combine domestic engineering expertise with global manufacturing efficiency, enabling competitive pricing without compromising quality or lead time. Coi Rubber’s product range includes: Automotive rubber components (gaskets, seals, mounts, bushings) Custom extrusions for doors, windows, and weatherproofing applications Industrial vibration and noise isolation parts Custom OEM components developed to customer specifications The company’s facilities maintain rigorous IATF 16949 certification standards, ensuring compliance with global automotive quality systems. Its strategic partnerships across Asia and North America enable robust supply chain resilience, JIT (Just-In-Time) logistics, and technical support tailored to customer needs. Under the leadership of David Chao, President & CEO, Coi Rubber has built a reputation for reliability, engineering integrity, and customer-centric service. With continued expansion — including the acquisition of its new Pomona, CA headquarters and warehouse — the company is positioning itself for the next phase of growth: deeper automation, enhanced domestic capabilities, and a legacy of innovation-driven sustainability.

Sponsorship in October 2026

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18 REVIEW(S)

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Premier Medical Supply

  • 5
  • on: September 19, 2023 at 07:52:09

Positive

Williams Web Solutions, a True Marketing Expert

Many years ago we hired Williams Web Solutions to handle our online needs with a stunning website and had been pleased with the service. Through their patience and neglect on our part, we allowed our website to lapse and our domain. Once we discovered our error, we immediately contacted ONLY Williams Web Solutions to resolve our problem. Within no time at all they redesigned and relaunched a much more beautiful website than we could have imagined and fully submitted it into Google. Since then, business has been booming and we have only Williams Web Solutions to thank for that.

  • Hired for:
  • Web Design
Read Full Review
Experience Ratings
  • Quality of Services: 5
  • Response Timing: 5
  • Communication: 5
  • Value for Money: 5
  • Achieved Results: 5

Best part of the experience?

Fast, honest, and successful. They absolutely did exactly what they promised to deliver and more.

Any suggestion or changes about the experience?

I would not and never change my experience. Williams Web Solutions has been phenomenal on our first design and definitely on our revisit with the new design.

Overall Feedback:

Many years ago we hired Williams Web Solutions to handle our online needs with a stunning website and had been pleased with the service. Through their patience and neglect on our part, we allowed our website to lapse and our domain. Once we discovered our error, we immediately contacted ONLY Williams Web Solutions to resolve our problem. Within no time at all they redesigned and relaunched a much more beautiful website than we could have imagined and fully submitted it into Google. Since then, business has been booming and we have only Williams Web Solutions to thank for that.

  • You hired them for:
  • Web Design
  • Hired in: 2013

Safety Eyes of America

  • 5
  • on: September 5, 2023 at 15:22:09

Positive

Long-time customers

Many years ago when we first started our business—Texas Industrial Safety Specialists—we were searching for a local website developer from our area. We were very surprised to discover a development agency less than an hour away from our very small town. We contacted Robert at Williams Web Solutions. Not only did they develop a beautiful website for us, but when we opened our newest business venture several years ago, it was a no-brainer that we contracted Williams Web Solutions again to take care of our website. We have been very pleased with his work and they are always quick to handle any needs that we have, even long after the website was developed. If you’re looking for a website designer, we ONLY recommend Williams Web Solutions.

  • Hired for:
  • Web Design
Read Full Review
Experience Ratings
  • Quality of Services: 5
  • Response Timing: 5
  • Communication: 5
  • Value for Money: 5
  • Achieved Results: 5

Best part of the experience?

Prompt service and very knowledgeable staff to any issues and needs that we've had.

Any suggestion or changes about the experience?

Had a minor issue with a couple of images that were copyrighted and we couldn't use on our website but that was resolved very quickly.

Overall Feedback:

Many years ago when we first started our business—Texas Industrial Safety Specialists—we were searching for a local website developer from our area. We were very surprised to discover a development agency less than an hour away from our very small town. We contacted Robert at Williams Web Solutions. Not only did they develop a beautiful website for us, but when we opened our newest business venture several years ago, it was a no-brainer that we contracted Williams Web Solutions again to take care of our website. We have been very pleased with his work and they are always quick to handle any needs that we have, even long after the website was developed. If you’re looking for a website designer, we ONLY recommend Williams Web Solutions.

  • You hired them for:
  • Web Design
  • Hired in: 2013

Custom Projects HTX

  • 5
  • on: August 17, 2023 at 15:27:18

Positive

Beautiful Website

Because of a friend’s recommendation, I was introduced to Williams Web Solutions. I contacted them and was pleased to hear how knowledgeable they were about my type of business. After almost nearly a year of communications, we decided to pursue this arrangement. Robert at Williams Web Solutions got to work with asking all the right questions and began working on the website. After a time, they developed a very beautiful website. With a couple of minor tweaks, we are pleased to have our very beautiful website. We at Custom Projects highly recommend Williams Web Solutions if your business in Houston needs a website design or redesign.

  • Hired for:
  • Web Design
Read Full Review
Experience Ratings
  • Quality of Services: 5
  • Response Timing: 5
  • Communication: 5
  • Value for Money: 5
  • Achieved Results: 5

Best part of the experience?

Beautiful design, lots of communication, knowledgeable staff, and price was very affordable

Any suggestion or changes about the experience?

I don't have any negative feedback about this business. It was a wonderful pleasure working with them.

Overall Feedback:

Because of a friend’s recommendation, I was introduced to Williams Web Solutions. I contacted them and was pleased to hear how knowledgeable they were about my type of business. After almost nearly a year of communications, we decided to pursue this arrangement. Robert at Williams Web Solutions got to work with asking all the right questions and began working on the website. After a time, they developed a very beautiful website. With a couple of minor tweaks, we are pleased to have our very beautiful website. We at Custom Projects highly recommend Williams Web Solutions if your business in Houston needs a website design or redesign.

  • You hired them for:
  • Web Design
  • Hired in: 2023