17-4 stainless steel, certified, aircraft grade, condition A, center-less ground to ensure absolute straightness, rust resistence, and consistency. Manufactured in a state of the art machine shop with CNC mills, lathes, drilling centers, and straightening machines. In house, digitally controlled, heat treating oven. All machines and materials are made in the USA. All machining is done on site, under strict quality control methods, to ensure the finest spear shafts available. 
 
Custom shark fin tab height and spacing configuration make these shafts ideal for use with roller spearguns. 3/32" shooting line hole drilled through the 2nd tab forward as not to impede the stacking of wishbones. Two-2mm dyneema wishbones can be stacked on the rearmost tab. 5cm tang length with euro notch. Machine pinned (2.4mm diameter), double offset floppers (1.2mm thick), hand tuned.