For making gaskets and packing valves; will withstand vibration and high-pressure. Recommended for plastic, stainless steel, aluminum, ceramic, synthetic rubber, monel, and carbon pipe, chemicals, corrosives, freon 22, hydraulic fluids, and aromatic fuels. Made with PTFE, is nontoxic, and tolerates temperatures of -400 deg. to +500 deg. F. Contains: 1 string 3/32" x 24" and 1 string 5/32" x 18". Carded.