A Compact and Economical Signal System When you have to make a deco or safety stop, or when you find yourself surfacing in choppy waves, this affordable signal buoy will alert boats and other divers to your position. The high-visibility orange tube is made of durable PVC, measures 51in/130cm in length and includes a tether and clip. It folds compactly and stows in its own storage bag with Velcro closure. The bag itself is fitted with a clip for attachment to a D-ring for quick and easy deployment.