The 3" core technique is far beyond the louvered metal tubes

or even rattle-free

Note: these chains come with a pin link (rivet style) master link

a US Quarter coin but any size matching Euro coin will do the trick at least as well

PS, 412 series shock set. 13". STD/Duty. Black 1980-08 Koppling/Gasvajrar The 3" core technique isDescription 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 best choice, heavy duty