Ye Feng, Foshan seals introduce a brand from Japan NOK HBY series product is a reciprocating ring buffer, sections: Combined, material: PU Standard Material: Main fluid BASF applies: General stone base hydraulic oil, this product is a combination of seals, the use of the piston rod, the main oil seal configuration, in order to absorb shocks and fluctuating pressure under high load, high temperature fluid isolation. Improve the durability of the seal, features: interior with a black nylon ring, in case of using the slide may bleed backpressure on the special shape of the lip slot can eliminate the pressure between the piston rod seal and cushion ring is a One paragraph trusted products, welcome customers come to buy, thank you!