All KB forged pistons are made from 4032 alloy

031" paper with silicone bead

Used to increase mid-range torque for more responsive acceleration off the line

Compatible with some stock speedo sensors like Dry-Reed and inductive proximity sensors as used on stock H-D and Buell models

with incorporated brake light switch with wiring

PS, 412 series shock set. 12". STD Duty. Black with cover 91-17 Dyna Drumbroms 1937-1972 fram&bak All KB forged pistons areDescription With full spring cover. 412 series shocks: Best value Progressive Suspension shock, great as stock replacement. Nitrogen charged double steel wall body. Multi staged velocity sensitive valving. Five position cam style preload adjustment. Note: Black 412 shocks may be supplied without lower cover. What are Progressive Suspension's 'Heavy Duty' shocks? If you are a lightweight rider with a lightweight passenger, STD Duty is probably your