Wired shaft 6.5 mm with a superior strength, dedicated for big game hunting". The new laser technology for affixing the shark fins increases shaft performance without changing the technical features of the hardened 17-4ph stainless steel. Shaft is equipped with two shark fins each rated at 661 lbs. (300 kg) and heavy duty barb. The Salvimar Metal Spear Gun shaft is equipped with a single barb Tahitian style tip and the gun is available in multiple lengths of 29.5", 33.47", 37.4" and 41.34" (75 cm, 85 cm, 95 cm, and 105 cm) and comes with an owner's manual.