RPM's pinion gear case includes the case and a peel-off decal sheet with two pinion to spur gear ratio charts for both 48- and 64-pitch gears. The appropriate chart can be placed in the recessed area on the bottom of the case. Also on the decal sheet is a set of numbered squares from 14 to 31 (gear teeth), that can be adhered to the inside of the case. There are ten blank squares so you can write in your own numbers if needed. Available in black or translucent blue.