o ring size 1.Quick shipment. 2.Standard size in stock. 3.Most competitive price. 4.ROHS approved. Details about o ring size: Materials Comply with ROHS, NBR, Silicone (VMQ), EPDM, Viton, etc.Characteristics Good physical and chemical properties.Hardness 20 to 90 shore A or as your request.Tolerance Strictly upon international standard, no flash.Color Black, transparent, green, red, yellow, grey, ...