Your 100cc engine’s piston retaining clips are utilized to lock the wrist pin inside the piston. With these piston clips, you can rest assured that both your engine’s piston and piston pin will stay connected to the crank arm. These 100cc Piston Retaining Clips are made of high grade steel. This will ensure you don’t run into any piston-related problems on the road. If you’re rebuilding your engine cylinder’s internal components, you’re going to want a set of 100cc Piston Retaining Clips.