Italian made 17-4 PH hardened stainless steel spear shafts. 7mm diameter. 3 tig welded mini shark fins tabs spaced 1 1/4” apart, starting 2” from the rear of the shaft. An additional cheater tab set forward 17 1/2” from the rear makes initial loading and powering down much easier. Ideally suited for either conventional or roller muzzle guns. Shooting line attachment point at the rear of the shaft for easy retrieval of your fish.