10PCS 4030251201 Gear 19T 44T for 200 250 350 222 282 362 7728 223 283 363 423 7828 Di2510 Di3010 Di351f This gear set is a replacement part compatible with models 200, 250, 350, 222, 282, 362, 7728, 223, 283, 363, 423, 7828, Di2510, Di3010, and Di351f.The part number is 4030251201.Each set includes gears with 19 teeth and 44 teeth.It is designed to restore functionality when replacing worn or damaged gears.