Or as they’re commonly known by in the dive industry; Safety Sausages. Whatever name you refer to them by the highly visible signaling tubes can attract the attention of a boat, from the air or someone on shore and that’s what we buy them for. Safety first. This tube is made of Cordura material is 45″ long and has an attached whistle. These tubes can be attached to a BCD D ring. Can also be attached to a reel and inflated by a breath or two of air underwater to be released to the surface.