Contents: 1 set of 8 pieces. Size: A = 0.8 inches (20 mm); B = 0.5 inches (12 mm); Compatible models: Majesty 250/4HC, 5CG, 5SJ, 5GM *If you use a pulley that uses 0.8 x 0.5 inches (20 x 12 mm). *Can be used from city rides to races. Can be used for setting or for normal repairing.