The 11/16" metric 17.5mm diameter has been added to the Speardiver small hole speargun rubber line up Speardiver Small Hole Speargun Rubber Tubing. Bridging the gap between 16mm and 19mm bands, now you can fine tune your speargun power even better.
Speardiver 1/16" ID tubing next to conventional 1/8" ID tubing