Custom developed by BBR Motorsports for the ultimate upgrade for mini four-strokes. Sized perfectly for fast/aggressive adult mini riders. This shock works for XR/CRF100 applications and also as a replacement shock for BBR's SuperShock by Elka which comes on Perimeter frame kits and some SuperComp Swingarm kits 30% stiffer than stock (most models) Preset and stress relieved for long life Custom wound from aircraft quality spring steel Powder coated finish