Anticorodal black frame with integrated spear guide, grip made of engineering plastic reinforced with glass fibre, high or low soft sternal support. Trigger mechanism made entirely in stainless steel with automatic return and buckling tooth stroke damper. Reversible side-safety mechanism. Reinforced reel with steel pin buckle. Head for double elastic with magnetic spear lock: as soon as the spear is put in place, it is held by two magnets mounted in a watertight chamber. This characteristic guarantees maximum speed of reset without the disadvantages of conventional mechanical restraint systems.