Narrow Active Differential set for XB2. The initial XRAY Active Differential is an exceptional, adjustable front side gear differential for XB2 . . . vastly boosting the buggy's price and handling faculties. The special design of interior elements using different angled portions allows the diff gears to interact on-power to enhance the forward traction, making it faster and simpler to drive. Even though the XRAY Active Differential is a performance choice for serious racers who want to gain a benefit on superior rate and maneuvering, it is also of great advantage to motorists of all of the amounts that are looking a more predictable and easy-to-drive automobile generally in most battle conditions. Ball-bearings not included. Notice: whenever building the Active Diff always use all 4 interior satellite gears. Never ever just utilize 2 internal satellite gears.