Four functions in one headset:1. IS42/28.6 l IS52/40, 79g/set2. IS42/28.6 l IS52/30, 87g/set3. ZS44/28.6 l ZS56/40, 115g/set4. ZS44/28.6 l ZS56/30, 107g/set- Full set CNC alloy- Supplied with two CNC alloy 7075 T6 crown races: ÿ39.8mm & ÿ30mm- Angular contact bearings- Upper: TK418CA:ÿ30.2x41.8x8x458x458- Lower: TK518B: ÿ40x51.8x8x368x458
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