DFX X Factor Shock Upgrade Kit - SPKTBETAXBeta X Trainer Shock Upgrade Kit 3 Stage Enduro 40mm OD x 12mm ID x 14mm H shock piston. Aluminium 7075, supplied with low friction piston band and o ring. Comes with piston and shim stack to suit a individual bike application, rider weight and style. 3 stage valving gives excellent traction and handling over any terrain. It vastly upgrades the ride feeling plush but predictable and that equals faster and more enjoyable time in the bush. This kit