colored o rings  

https://www.chinarubberseals.com/products/colorfulfkmrubberoring.html

Sanshi Rubber specializes in the production of colored rubber o rings. we are able to produce rubber o rings in almost any color. we do have a list of colors in stock and we often mold common materials such as NBR, and FKM for these colors. this creates a shorter lead time, lower cost and minimum for these colors compared to fully customized colors. lower costs and minimums.