Safety Helmet Feature: ANSI Z89.1-2003 ; EN397:1995 The photoluminescent safety helmet is made of solid Glow-In-The-Dark HDPE resin.The safety helmet is designed to make the wearer visible in a dark enviroment after only 10-20 minutes of exposure to sunlight or any incandescent light source. The safety helmets are suitable for night time construction workers,miners,and other workers operating in low-light to dark environments.The safety helmet illuminates for over 8 hours,but the level changes from 1100 mcd/m2 after 6 hours of continuous glowing which is still brighter than the requirements of ASTM 2073 Standards: CN: GB2811-1989; EU: EN 397: 1995; US: ANSI Z89.1-2003 Model number: NTB-6 Material: ABS Color: many colors available Outer packing: 20pcs/carton