Reinforced nylon body, withstand temperature from -20°C to +80°C. The steel shackleis chrome plated; the non-conductive shackle is made from nylon, withstandtemperature from -20°C to +120°C, ensuring the strength and deformation fracture noteasily. Key Retaining Feature: When the shackle is open, the key can’t be removed. Laser printing and logo engraving available if required. All different colors available.