1TS124-B: Gudebrod Artificial Sinew Bobbin 60 Foot/20 Yards 5-Ply 70LB Test Strength - Yellow - Sold by the Spool

Artificial sinew is a continuous filament, waxed polyester cord. Highly durable, ideal for stitching, wrapping, and stringing heavy or rough holed beads. Just like natural sinew, simulated sinew may be split down the middle to achieve a thinner diameter. 70 pound test strength.
Made in the USA!