Applicable models:For STIHL MS290 MS390 029 039 MS310 Part Number: 1129 640 2000 Tooth: 7 Pitch: 3/8"" Packing List: 1 x Drum Sprocket Clutch + 1 x Clutch + 1 x Bearing + 1 x Clutch Sprocket Collar + 1 x E-clip NoteIf you have any problems in the purchase process, you can contact me at any time, we are online 24 hours a day, you are welcome to enter the store for consultation Warm tip: please can rate our products after the have received, thank you for your support If you need to buy in bulk, you can contact me, I will give you an appropriate discount Applicable models:For STIHL MS290 MS390 029 039 MS310 Part Number: 1129 640 2000 Tooth: 7 Pitch: 3/8"" Packing List: 1 x Clutch Sprocket + 1 x clutch + 1 x bearing + 1 x clutch sprocket collar + 1 x e-clip