XRAY Active Dif segments are CNC-machined from extremely tough steel, and also extremely precisely-machined 'V' ramp grooves with 120° angle for simple disengagement adjustment. The section is hardened to ensure long life and durability. The portions are laser engraved with '120°' for simple and immediate recognition. Group of 2. The 120° sections give more instant response both on- and off-power. On-power the diff becomes very hard instantly (no delay); off-power the diff becomes free immediately (no delay). To be used on high traction tracks. Active Differential sections can be found in three different 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