HoBao has designed a new "Locking" Spring Cup Holder (Patented) for the 17mm big bore shocks. The new cup holder features a "Locking" mechanism which will prevent the springs from popping out of the shocks during racing. The new cup holder is also stronger and has a quick release function to change the springs. The new "Locking" Spring Cup Holder will be standard on all HoBao vehicles with big bore shocks.