Compatibility: Work on Beystadium X Acceleration Gear System Perfect Start Pack: Include 1 Gyro X right-spinning top and X string launcher for quick launches with no need to insert a ripcord [Worry-Free Purchase] - If you ever have questions or run into an issue, please give us a chance to address your concerns. Just send emails or contact us Great game for playing with your family or friends, you can feel the joy of fighting in your play. · Perfect gift for kids Children's Day/ Christmas / Birthday.