It is durability and lightweight anger to a JaIKeuRal 7075 (DyuRalRyuNyum) material..A SBS system (I hit a double torture suit)..It is a TalBuChakGaNeungHan PUSH&PULL system so as it informs, and it pulls it, and to be convenient..Be comfortable, and I provide it of a wrist in case of a going on foot to dual grips..A tungsten...