Includes 2 sets of blue and red springs. Blue are stiff and red are soft. Also included are a four washers some replacement swivel balls and a couple of screws. To help ensure a fit please check measurements below. 90mm in length between center of fixing holes. Total length end to end 98mm. Diameter 18.10mm at its widest. To suit 3mm screws at the bottom and 4mm at the top.