Nova Engines 16x22.5mm .21 Copper Head Gasket Shims .1mm

Nova Engines 16x22.5mm .21 Copper Head Gasket Shims .1mm. This shim set is designed to fine tune your nitro engines performance based on conditions. Made from copper, these shims come in a variety of thicknesses to accurately adjust the gap between the piston and head button to adjust compression.