The C2P brand shims are hi-quality steel valve shims made with (Sandvic 20c) material for the best possible consistency. They come in a variety of sizes ranging from 6, 8, 12, and 16mm, ID in metric and .500 ID in imperial (Penske). The shock shims OD start at 16mm and go up to 44mm in 2mm increments, with the thickness from .10, .15, .20, .25, and .30mm. The fork shims OD start at 8mm and go up to 32mm in 1mm increments, with the thickness from .10, .15, .20, .25, and .30mm. The .500 ID shims come in .750, .900, 1.050, 1.200, 1.350 inch OD sizes and range from .004, .006, .008, .010, .012, .015, and .020 thicknesses. Some ring shim sizes are also available.