Demolition Whistler Lite Cassette Hub takes strength & durability & makes it a little more affordable, it's a truly tough hub that can tolerate plenty of abuse. The smaller & lightweight hub shell is built from 6061-T6 alloy steel & paired with a straight 14mm heat-treated chromoly axle. It also features individual spring, 3 pawl engagement for a positive feel & classic sound, two large sealed bearings in the hub shell & three bearings in the 1-piece driver. The Demolition Whistler Lite Cassette Hub comes with a non-drive side hub guard. section Product Specs HUB TYPE: Cassette AXLE: 14mm Male DRIVER: 9t DRIVE SIDE: Left Side Drive SPOKE HOLES: 36h WEIGHT: 496.1g (1.09lbs)