Axle : Long axle. longer sleeps and weaker loops
Spacer : Thinnest. for the longest sleep
Starburst Response : Starburst rays are short, for longer sleep times.
Axle : Balanced all-around, for all kinds of tricks
Spacer : Most balanced setting
Starburst Response : Good balance of sleep and responsiveness.
Axle : Short axle. Strongest, fastest loops
Spacer : Thickest. for the most responsiveness.
Starburst Response : Most responsive, bring on the loops.