Function of product: High performance spring can increase speed and reduce clutch failure. 2000RPM springs provide strong grabbing power and higher RPM at take-off, sacrificing some smoothness for increased power during acceleration. Fits: 50cc-100cc GY6, 139QMB, and 1P39QMB engines. Compatible with Scooter, Moped, ATV. Production materials: Made from high strength materials for stable performance. Surface coating resists wear and provides a glossy finish to enhance the appearance of your motorcycle. Please Note: Verify compatibility with your motorcycle before purchase. Understand the spring performance requirements, as performance varies between 1000-2000 RPM. Actual performance of upgraded parts may vary due to other factors. Scooter 2000RPM clutch spring torsion spring compatible with Aerox, Axis, Breeze, Jog, Neo's 50cc AC models. 2000RPM clutch spring - torsion spring Note: Red spring rated for 2000RPM (2K) Color: Red Material: Metal Package Contents: 3 x Clutch spring (Small) 1 x Clutch spring (Big) Package includes only the items listed above; other accessories are not included. Note: Lighting and display differences may cause slight color variations between the image and actual item. Measurement tolerance: +/- 1-3 cm.