This listing includes 1 brand new variator assembly for gy6 125cc or 150cc, 4 stroke engines (157qmj or 152qmi found on scooters, ATV's, go karts). Good quality! The variator kit comes with 12 gram roller weights (18MM X14MM). Fan: 4 1/2 inch diameter and has 13 teeth. This is most common variator on  Chinese scooters. Please see the picture before purchasing! Fits most scooters and mopeds with 157qmj or 152qmi engines in some of the following brands (but not all models) - Roketa, Sunl, Baja, Kazuma, Carroll, Stream, Eeagle, Taotao, Redcat, Tank, Giovonni, Aimex, Jackel, Wildfire, Xtreme, Qlink, Yiben, Jonway, JM Star, Vento, TNG, VIP, etc.