http://www.simplysnorkel.com/products/Mares/TorpedoBuoy.aspx
The Torpedo Buoy from Mares Pure Instinct range is designed to be used for freediving and spearfishing. This marker buoy has been constructed from a heavy duty PVC for great durability and is supplied with a 20 metre line and karabiner. The Torpedo, as its name suggests has a streamlined aerodynamic shape for moving easily and comes with a hook for securing spearguns when not in use. A separate compartment can be filled to stabilise the buoy if there are high winds whilst freediving.

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