17-4 PH hardened spring stainless steel shaft with 5 (3.5mm high) mini shark fin tabs. An additional welded D-loop provides the ideal location to rig your dyneema shooting line. The first shark fin is located in the middle of the shaft, making it easier to load and power down. The second shark fin is centered in between the first and last 3 shark fins. The rearmost shark fin is welded further back than conventional shafts, providing an additional 5cm/2 inches of rubber stretch. Two bridals can be overlapped and loaded onto the rearmost shark fin due to its unique design. The 3.25 inch long, hardened stainless steel offset floppers have a 3/32 inch pin welded on each side to ensure greater reliability and perfect tuning. They are factory certified for straightness. The 150cm long shaft is ideal for a 110-115cm long barrel with less than 8 inches of shaft overhang. The 8mm shaft diameter is perfect for a double roller speargun powered by twin 14mm reactive rubber latex bands, or any open or enclosed track speargun that accepts euro notched shafts. Tri-cut tip for exceptional penetration and tip retention.