Nylon 6/6 Round Rod, Opaque Black, Standard Tolerance, ASTM D5989, 1/4" Diameter, 5' Length Nylon 6/6 offers excellent wear and abrasion resistance and has a low-friction surface Nylon 6/6 provides greater strength than nylon 6/12 and absorbs moisture more slowly than nylon 6 Color is opaque black Meets ASTM D5989 specifications