The ZAP™ Law Enforcement Retrofit Kit contains everything needed to convert a helmet with a strap suspension system to the ZAP™ pad system. The kit includes a set of seven 5/8-inch or 1/2-inch ZAP™ pads, 18 hook disks, a 4-point (Standard) chinstrap with anti-microbial chin cup, alcohol swabs, and an illustrated instruction manual.