Narrow Active Differential set for XB2. Initial XRAY Active Differential is an exceptional, adjustable front part side component gear differential for XB2 . . . greatly boosting the buggy's cost and handling characteristics. The initial design of interior elements using different angled portions allows the diff gears for connecting on-power to enhance the forward traction, making it faster and better to drive. Even though XRAY Active Differential is a performance selection for serious racers who would like to gain a benefit on superior price and maneuvering, it's also of good advantage to motorists of the numerous amounts trying a predictable and easy-to-drive automobile for a few battle conditions. Ball-bearings maybe not included. Notice: whenever building the Active Diff always use all 4 inside satellite gears. Don't ever just use 2 interior satellite gears.