This is a pack of four replacement XRAY Shock Foam Inserts, and are intended for use with the XRAY T4 1/10 scale electric touring car. These foam inserts for XRAY shocks go between shock upper mount and rubber membrane. The low-profile shock foam inserts allow for easier shock rebound adjustment. These T4 shock foam inserts must be used with XRAY Shock Membranes (XRA308082), and will only fit Super Low Profile (SLP) shocks.