Contents: 1 set of 8. 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 20 x 12 mm pulley, you can use it from city rides to races. Can be used as a setting or for normal repairs (repair).