... 5. Color: black, transparent, green, red, yellow, grey, purple, pink rubber washer, etc. or upon your color codes. 6. Processing: all ... electrical appliance, mechanical, industrial, construction, household, medical and other fields rubber washer. 10. QC/QA: we have strict quality control and ... testing room. 11. We have many different sizes of o rings in stock now, includes all of the standard size and ...