Extruded 6061-T6 Aluminum 38mm deep-aero section rimProprietary precision machined alloy hubs with custom depth flanges for extra stiffness. Sealed cartridge bearings. Hand-built assembly. Color: Black gloss finish with colored decals, black hubs and black spokes. Weight: 1675 grams (w/o QR)* Wheels come standard with a Shimano/SRAM compatible freehub. Campagnolo freehub option is sold separately.