Metal plates inside to be attachable to the PITAKA magnetic car mount. Made of 100% aramid, a high-tech luxury material for body armor, aero space, supercars. Weightless feel. Weight less than 14g. One of the lightest case on the planet. Extremely Thin. A slim profile of 0.65mm only. Extraordinary scratch resistant, grippy but non-slippy coating Ridiculously durable and incredibly strong. 5 times stronger than steel at the same weight. No interference to WIFI, GPS, Apple Pay, Wireless charging or your signals.