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 double spearguns. 5cm tang length with euro notch. 3/32" shooting line hole drilled through the rearmost tab (single tab version), or 2nd tab forward (2 tab version), as not to impede the stacking of wishbones. Stack both wishbones on the rearmost tab for double roller use. Machine pinned (2.4mm diameter), double offset floppers (1.2mm thick), hand tuned.