Flat Sinew is a flat, waxed polyester thread that is waterproof, rot proof, resistant to stretch, and extremely strong. It has a very high tensile strength for it’s size, it doesn't stretch when wet like string does, and because of the wax you can tie things up very tight. This makes Flat Sinew a great alternative to rubber bands for Tie-dye. Flat sinew is featured in our popular Tie Dye 101 DVD series for ease of use and the ability to tie clear and/or complex patterns. It comes in 125 or 900 ft lengths. It is also excellent for use with delicate fabrics which can be damaged by rubber bands. Plus, Flat Sinew won't get old, dry and brittle like rubber bands will over time.