High-quality fork oil seals in OEM quality, which differ from the commercially available oil seals made of NBR (nitrile rubber) due to their exceptional and unique XNBR (carboxyl elastomer) material. This compound exhibits excellent abrasion and temperature resistance, as well as resistance to the oils and additives used in modern motorcycle and scooter forks. Each delivery includes a sachet of "Arisil" special grease to extend the durability of the various components. Dimensions (mm): Inner diameter x Outer diameter x Installation height / Total height Item Type Design Fork Oil Seals Outer Diameter 52 mm Features Set Installation Height 8.0 mm Total Height 10.5 mm Main Color black Inner Diameter 40.0 mm