Stay Strong's Reactiv Hubset covers all your hub needs, with all those important factors included like strength, durability with a weight for both that's closer to a single rear hub. Both hub shells are made from alloy and both fully sealed, the front hub has an alloy female axle with a hollow axle in the rear hub. Lastly the Stay Strong Reactiv Hubset features 6 Pawl with 180 points of engagement and an alloy 7075 16 tooth cog. ###section### Product Specs HUB TYPE: AXLE: 20mm Front, 10mm Rear DRIVER: DRIVE SIDE: Right Side Drive SPOKE HOLES: 28 & 36 options WEIGHT: 707g (1.56lbs) Colour: Black; Size: 36h 20mm Front Axle, 28h 10mm Front Axle, 36h 10mm Front Axle