KOSO Performance Variator Roller Weights 16 Gram 18 x 14 mm for GY6 110cc 125cc 150cc Scooter Moped ATV Go Kart QMJ/QMI157 QMJ/QMI152 Taotao Sunl Roketa JCL Brand new KOSO variator performance roller weights set Fit most GY6 110cc 125cc 150cc scooter variators Fit mopeds with 125cc-150cc 4 stroke GY6 QMJ/QMI157, QMJ/QMI152 engines Dimensions: 16 gram; 18 x 14 mm Heavier roller weights = A slower take off speed with more acceleration and a higher top speed