Made from mild steel. Chin strap is given to hold it on head during movement. 9mm flat rings aventail. Front to back:- 9 inches (24 cm). Ear to Ear:- 8 inches (20 cm). Circumference:- 27 inches (70 cm). Weight:- 4 Kg. Sheet Thickness:- 16 Gauge (1.5 mm). Size:- Standard size, fits almost all adults. And Small items is send through India post it take 10-12 days.