Having spare parts for your gun or sling is the only way to assure you won't get skunked on a spear fishing trip. Constructed of corrosion resistant 17-4 (spring) stainless each JBL shaft is hand-tuned for alignment then heat-treated for maximum hardness to reduce flex and provide optimum energy transfer. The shaft for the Woody Competition Magnum Spear Gun measures 44" x 5/16" (111.76cm x 8mm) and has 6mm threaded end. Spear shaft has a 3 sling capacity and makes a great save a dive kit item. Shaft is covered by a 12 month limited warranty.