Specifications: 32 holes, 2*NBK bearings for front hub, 2*NBK bearings for rear hub Structure:NBK bearing; AL7075 T6 aluminum alloy shaft, AL6061 body; PCD 58MM, 3pawls O.L.D: Front QR 100MM * 9MM , followed by QR 135MM * 10MM ; support barrel axis quick release interchange; Weight: 230 grams of front hub and 454 grams of rear hub.