MMG Variable Speed V-belts offer stability and flexibility at the same time. Quality made for high mileage and reliability. Oil and heat resistant. Please make sure this is the right size for your system. BELT SIZE: 842 20 30 Replacement for GY6 125/150cc 152QMI 152QMJ 157QMI 157QMJ “long case” engine Premium “reinforced” Drive Belt Replacement for GY6 125/150cc 152QMI 152QMJ 157QMI 157QMJ “long case” engine. This belt is found on the Baja, JMstar, Jonway, Lance, NST, Peace, Roketa, Sunl, Tank, TNG, Vento, VIP and many others. Note: Scooters with a long case usually have a 12″ – 16″ rear wheel. It may fit many other scooters, motorcycles, ATVs Belt Size: 842 mm Length x 20 mm Width x 30 mm teeth spacing This belt is reinforced, superior performance characteristics reduce belt stretching and distortion that can adversely affect the quality of your engraving while providing long belt life.