These ties are injection-molded of 6/6 nylon— won’t corrode or stretch. Durable locking mechanism holds securely even when used to bundle vibrating or flexing materials. Ties continue to hold tension even in oily spray or wet environments. Easily apply ties by hand or use a tensioning tool—order tools separately. Ties are UL-component recognized, and are self-extinguishing as per UL 94 Flam. Class: V-2. Ties withstand temperatures to 185°F (85°C) and have a melting point of 495°F (257°C). All ties remain flexible to -40°F (-40°C). Efficient range of ties may be higher or lower in your specific application.