This listing includes 5 sets of drive gears, with each set containing small, middle, and big gears for a total of 25 pieces.These components are compatible with Mettler Toledo Tiger models including 8442P, 3600, 3610, 3650, 3660, 3680, 3950, 3960, 3880+, and 3880E+.The gears are designed to fit the specified scales and function as replacement parts to restore function.