Finish Line Shock Oil 15wt 16oz / 475ml is a premium suspension fluid formulated specifically for oil damped bicycle forks. 100% compatible with ALL suspension designs & seals. Finish Line Shock Oil is a semi-synthetic mineral oil formulation that has become the choice of professionals worldwide. Will not thicken or thin due to changes in temperature. Low foam technology delivers consistent & predictable damping in all riding conditions. A high viscosity index provides consistent damping through the longest & most extreme of riding conditions. You can speed up or slow down your forks compression & rebound characteristics by changing the oil viscosity. Available in 5 different oil weights: 2.5wt, 5wt, 7.5wt, 10wt, 15wt. 2.5wt is lighter/thinner/faster. 15wt is heavier/thicker/slower. If youre lightweight/smaller, go thinner – if you’re bigger/heavier, go thicker. Plus, you can change the oil height/fill volume in your fork to make the spring rate more linear/equal or progressive/increasing as it comes to the end of the compression stroke/travel. Features Combines reliability of mineral oils with durability of synthetic oils Race proven, good for all suspension systems, seals, & riding conditions Prevents stiction & viscosity breakdown Won’t foam – provides consistent & predictable damping.