... sizes all available. Description of Aging-proof Flat O-ring with High Quality:1. Materials: can be NR flat o ... . Color: black, transparent, green, red, yellow, grey, purple, pink thick o ring, etc. or upon your color codes. 6. Processing: all ... , KTW, WRAS, LFGB, etc. 8. Applications: automobile flat o-ring, electrical appliance, mechanical, industrial, construction, household, medical and other fields ...