... Most competitive price. 4.ROHS approved. Details about o ring size: Materials Comply with ROHS, NBR, Silicone (VMQ), EPDM ... Sample charge Free samples are available if standard size.Quick shipment 1-2 weeks. Packing PE ... OEM and ODM are highly welcomed, V ring, D ring, X ring are all available.Our advantages:1. Strong ... all kinds of o ring, AS568, JS, Metric and BS o rings are all available. o ring size