Function of product: High performance spring can increase speed and reduce clutch failure, 2000RPM Springs will give you the greatest grabbing power and a higher RPM at take-off.Sacrifice some speed to give you more power when you go . Fits: 50cc-100cc GY6, also fits 139QMB and 1P39QMB Engines Scooter Moped ATV. Production materials: High strength materials, stable performance, give you use. The surface coating is and not easy to off. It has a glossy appearance and decorates your motorcycle. Please Note: Please check carefully whether the product matches your motorcycle. Please be clear about the spring performance you . The performance of 1000-2000 rpm is different. The exact performance of upgrade parts will be affected by many other factors. in providing parts and accessories for Off-Road Motorcycles, Karting, ATV and Scooters/E-Scooters. Scooter 2000RPM clutch spring torsion spring for Aerox Axis 's Breeze Jog Neo's 50cc AC 2000RPM clutch spring - torsion spring Note: Red spring 2000RPM (2K) Colour: red Material: metal Package Contents: 3 * Clutch spring (Small) 1 * Clutch spring (Big) Only the above package content, other are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.