Sailrite cotton webbing Use this flag tape along the hoist edge (or all edges) of flags for strength. A catch cord is a yarn that binds the "knitted" needle edge of webbing woven on a needle loom. 100 S. Cotton Duck #8 Off White 18 oz. Sailrite webbing options are made from six different materials. Sailrite stocks webbing for all your DIY needs at a low price. I think these added parts actually destoyes the strength, because they will take up much more force than will happen in a pure diamond og W pattern. Because this is a cotton/polyester blend webbing, it can be cut with a hotknife. Cotton webbing does not have a high UV resistance, so it's not recommended for permanent outdoor applications. Cotton/Polyester Flag Tape White adds strength and reinforcement for grommets. wogxgejjneziltrtvktlwsllbgqrjejpqailhntxzqetslhjjnzprbtzfoczyjdmtmugcohafpyaj