This set of gears contains 40, 30, 20 and 12 tooth gears and 3 bushings. There are 4 sprues per package. 2 mm motor spindle 12 tooth gear included. (40, 30, 20 tooth gears have 3/16" hole diam) Each sprue has 7 pcs as seen in the picture. Sprues come in a variety of colours.