This is a pack of two Flash Point MIP 16mm 8-Hole Bypass1 Shock Pistons designed for use with the Mugen 16mm big bore MBX shocks. The MIP Bypass1 shock pistons are a great upgrade for Mugen 1/8th kits! These shock pistons are fully customizable and allow you to control your shocks' rebound speed and your car's performance. MIP Bypass1 Shock Pistons are also Dyno Tuned to ensure they match the compression characteristics of the stock pistons.