Hard Bushings provide high resistance to turning throughout the entire turning range & ultra quick response. Hardness: 96A. Medium bushings are formulated for the majority of skaters who already have good control of their board & just want quick, positive response, centering & the control to skate anything or anywhere. Hardness: 91A. Provide very easy turning, quick, smooth response & good centering. We recommend them for skaters who like their trucks loose, but not floppy, longboarders, & little skaters for whom a soft Hard Core will feel like a medium or firm bushing. Hardness: 81A.