XRAY Active Diff portions are CNC-machined from extremely tough metal, while having extremely precisely-machined 'V' ramp grooves with 60° angle for simple engagement/disengagement. The segment is hardened to ensure long life and durability. The sections are laser engraved with "60°"" for simple and immediate recognition. Pair of 2. The 60° portions offer an excellent balance of performance between on- and off-power. On-power the diff becomes difficult after a delay. Off-power the diff becomes free after a delay. For use on low traction tracks. Active Differential Segments can be found in three various alternatives: #352123 - 60° #352125 - 90° #352127 - 120° Active Differential Segments fit: #325100 - Active Differential for XB2/XT2/SCX #365100 - Active Differential for XB4/XT4 Font/Rear #365101 - Active Differential for XB4/XT4 Center"