Produced from Silicon rubber. Light in weight, easy to use & low maintenance. Speech Diaphragm for easy & audible communication. ‘Zero’ power Hard Coated Visior. Two Point adjuster for quick fit. 5-Strap head harness. Provides head support & even distribution of weight. Good skin comfort in tough conditions. Provide leak proof fit. Standard Thread. RD40 Thread for connection to any standard thread cannister as per – IS 14138 (part 1): 1994. Exhalation Valve to allow efficient escape of CO2. Pentabelt Hard coated "0" power visitor. Strong adjustable elastic bands. Inner face piece. Produced from neoprene rubber.