The PROX Valve Shims (8.9mm) are precision-engineered from high-quality materials to ensure maximum durability and performance. Each shim undergoes a targeted heat treatment process to achieve optimal hardness, thus minimizing wear and tear. This set includes three shims each of sizes ranging from 1.74 to 2.58, making it an ideal fit for a variety of KTM, HQV, and GASGAS models. Perfect for maintaining and enhancing your engine’s performance, these shims are a must-have for any motorbike enthusiast.