JRL Piston And Ring Fits For 150CC LIFAN Engine Pitbike Pro Thumpstar Dirt Bike 56.5mm 150CC LIFAN Engine Pitbike Pro Thumpstar Dirt Bike 56.5mm Piston And Ring Size:Piston Diameter: 56.5mm Pin Diameter: 15.00mm Package Include:1*Piston 1*Piston Pin 2*Piston Pin Clips 5*Piston Rings Match original equipment exactly for a perfect fit, easy to install. Please check for the details and make sure this is the right one you need.