These Schumacher Racing Products big bore shock collar o-rings are a factory replacement seal for the shock collar on Schumacher big bore shock assemblies. Sold in a pack of four, they help maintain a proper fluid seal at the shock collar to prevent leaks and keep shocks performing consistently. Keeping a set on hand is recommended for regular shock rebuilds. Features: Pack of 4 o-rings Designed for Schumacher big bore shock collars Replacement shock seal for preventing fluid leaks 7/7/26 cs