Mascot starter spring mainly used to start gasoline engines of garden machinery. Large torque, low noise and relatively long lifecycle. Our material is stable and cost-effective which is made of Korean carbon steel with 0.4-0.8mm and 5-10mm width; The service lifecycle can reach 5000-20000 times, which is related to the thickness.Welcome to contact us with your drawing sheet or data( spring thickness, width, working length, inner diameter, outside diameter) . we are pleased to provide you with cost effective products.