Fit for: Most of Chinese brand like Jmstar Taotao Roketa Sunl Kazuma JinLang Jonway Znen Redcat Eagle Xtreme Yiben SSR Vento etc…. 22 splines inside the clutch drum/bell Specification: Outer Diameter of drum: 115mm / Inner Diameter of drum: 106.5 mm / Pulley diameter: 118.5mm Product Description Fits for: GY6 50cc scooter 139QMB engine and most of chinese brand like BAOTIAN, BASHAN, BENZHOU, CFMOTOR, CHARMING, DAYANG, DINLI, FUXIN, GEELY, GILERA, HANGLONG, HAOJIN, HAOJUE, HONGZHOU , HUATIAN, JIAJUE, JIANSHE, JINLUN, JMSTAR, JONWAY, KAITONG, KEEWAY, KINROAD, LIFAN, LINGBEN, LINGTIAN, LINHAI, LINTEX, LONCIN, LONGJIA, MAWI, MEIDUO, MOTORRO, QINGQI, WANGYE, WONJAN, XINGYUE, XINLING, XINTIAN , YIBEN, YINGANG, ZHONGYU, ZNEN, ZONGSHEN, etc. Specification: Outer Diameter of drum: 115mm / Inner Diameter of drum: 106.5mm / Pulley diameter: 118.5mm 22 splines inside the clutch drum/bell Package Includes: 1 * The Complete Driven Pulley Clutch