Calterm cable ties are manufactured from the toughest of materials, pure virgin nylon 6/6. Harsh environment-grade nylon is insoluble in common solvents, alkalis, dilute mineral acids, most organic acids and most petrochemicals. Patented Double Lock design, with locking teeth on both sides of the tie and at the head ensuring a stronger connection and 50% greater tensile strength than the industry standard. The bent tip ensures easy insertion into the tie head while close serrations on both sides of the tie promote precise adjustment. The smooth edges ensure easy "slip" as you tighten while finger grips on the end ensure a secure and comfortable grip when hand-tightening. Operating temperature range is 100% capacity up to 65 deg C (149 deg F), 50% capacity from 65 to 185 deg C (149 to 365 deg F).