Project 7 Protech XCAL-US ICW Plate is made of a ceramic/polyethylene composite, the X-CAL US is the state of the art in rifle protection. The latest addition to the Project 7 plate lineup, the X- CAL US is designed to work in-conjunction with soft armor ballistic packages and has been tested against 5.56mmx 45mm 62 grn. M855 (green tip) ammunition as well as 7.62mm x 39mm 123gr. MSC ammunition. Weighing only 3.8lb, the X-CAL US is a light weight, high perfomance, cutting edge option for rifle threats.