The Duncan Ballistic was a fully personalized high performance yo-yo. Every feature can be adjusted to meet your personal style of play. The ball-bearing transaxle gives excellent sleep time, and the Duncan Key gives you access to the inside of the yo-yo, so that you can change graphics or steel ball weighting. The six ball weights (eight were included) let you customize the yo-yo by adding weight to the rim for long sleep times, centering the weights at the axle for looping, or removing the weights for a lighter feel. The string gap is adjustable as well for variable performance.