This is the Riffe Mid-Handle Series #I ISLAND Teak Speargun Features: Heavy-duty 4 laminate teak stock with side machined grooves for ease of handling 5/16?(8mm) threaded shaft with large replaceable two-barbed spearhead (3) 5/8? (16mm) power bands Models #N and #I come rigged with 300lb. Monofilament shooting line for faster shooting and abrasion resistance. Model #W comes standard with 400lb. Monofilament. 5? Bungie Shock Chord with 500 lb. test Pigtail Swivel All models include reinforced teak wedges for added muzzle strength Models #I and #W have a bolt through muzzle for added reinforcement when using 4 or more bands Heavy-duty reinforced glass filled Nylon handle with over molded cushion grip RIFFE's stainless steel 2-piece trigger mechanism assembly, accepting all diameter shafts 1/4?(6.5mm), 9/32?(7.1mm), 5/16?(8mm), 3/8?(9.5mm) Locking-pin safety Large contoured red urethane butt end assembly for comfortable hip & stomach loading Accepts all RIFFE parts & accessories RIFFE Mid Handle Series wood spearguns offer more maneuverability when tracking game. Primarily a stomach loading speargun. The most desirable for close bottom and blue water spearfishing alike. The speargun of choice for those serious blue water hunters pursuing pelagic fish of the open ocean.