This nylon bracelet is about 1 1/2" wide by 2 1/2" diameter made from a soft core parachute cord so it is flexible but holds shape nicely. The design is based on the "Diamond Pattern" page 241 in the Ashley Book of Knots. Made from a single piece of cord. Many more like this in the online shops:
WhatKnotShop on Etsy
WhatKnotShop on Zibbet
design and photographs copyright 2007 WhatKnotShop