Model: | SB9-HDMM - Heavy Duty - Street Modified Disc, SB9-HDG6 - Heavy Duty - Street/Strip - 6-Puck Sprung, SB9-HDG4 - Heavy Duty - Street/Strip - 4-Puck Sprung, SB9-HDR6 - Heavy Duty - RACE ONLY - 6-Puck Solid, SB9-HDR4 - Heavy Duty - RACE ONLY - 4-Puck Solid |