... price. 4.Small quantity accepted. Details about rubber viton o-rings : 1. Materials: comply to ROHS, Viton, or NBR, Silicone (VMQ), EPDM, etc. 2 ... A or as your request. 4. Tolerance: strictly upon international standard, no flash. 5. Color: black, transparent, green, red, yellow, grey ... production. 5. 2 sets of advanced trimming machines to assure non-flash products. 6. 20 QC technicians and 6 R&D ...