Details and Specs for Profile Mini Cassette Hubs :

Smaller, lightweight version of the pro size cassettes. Low flange 6061 shell, cassette driver with 4 pawls for quick engagement, hollow aluminum internal axle for weight savings. Includes 3/8″ studs and sealed bearings. Made in the U.S.A. (21.6 oz) Sold in Pairs. Cog Included.
Front Replacement Parts
Center Axle: 439058
Axle Bolts: 3/8″x16tpi w/ 5/16″ Allen Key
Hardware: Aluminum Slip-on
Hub Shell Bearings: 6903 (x2)
Weight: 21.6 oz (Pair)
Rear Replacement Parts
Center Axle: 439058
Axle Bolts: 3/8″x16tpi w/ 5/16″ Allen Key
Driver Bearings: 6802 (x2)
Driver Pawls: 437114 (x4)
Driver Spring: 437115 (x4)
Hardware: Aluminum Slip-on
Hub Shell Bearings: 6903 (x2)
Weight: 21.6 oz (Pair)