NOS OEM Polini piston ring 44.4 mm for 65cc X5 XP65R Minicross minibike, water cooled. This came out of a closed dealership that was selling a lot of Polini Minicross bikes to racers in the Houston, Texas area from the late 1990s thru the mid 2000s. I have a large box of new Polini Minicross parts from that time period that will all be listed on ebay. Check out my other listings. I ship worldwide.