Pro X Valve Shim Kit Honda / Kawasaki / Suzuki / Yamaha 250cc-450cc ProX valve shims are made of premium materials which are then heat-treated to ensure hardness of the shims to deliver maximum durability and minimal wear. Next to the specific heat-treatment process the shims are precision machined to exacting specifications. Features: Made using a specific heat-treatment process to ensure hardness for maximum durability and minimal wear Precision machined to exact specifications Inexpensive replacement for expensive OEM shims Includes:  9.48mm OD shims in three of each size from 1.20mm to 3.50mm in 0.05mm increments Note: Images are for reference only, actual kit will vary per make and model.