ZORBIUM ACTION PAD SYSTEMDESCRIPTION The Zorbium Action Pad (ZAP) 7 Pad NSN System is the standard issue system authorized for use in all United States Army, United States Marine Corps and the United States Navy ground combat helmets. The ZAP system is compatible with ACH, LWH, MICH and ECH ballistic helmets. The set only includes seven ZAP pads: # 4 = 1 2 inch (crown pad is 3 4 inch) # 6 = 3 4 inch # 8 = 1 inch 1 circular crown pad 2 trapezoid pads 4 oblong pads Velcro brand