We are manufacture Rubber O Ring or O-RIng Box NBR or Silicon or FKM Best prices ,Good quality Fast delivery time Material: NBR, FRM, silicone rubberHardness: 70 A or 80 A or 90 AO-ring Kits AppliceationAfter MarketingCAT, HITCHI, KOMATSU, CATO, KOBELCO, DAEWOO, HYDNDAIOthers earthmoving machine. The size according to customer require.