The Metal: High quality 18 Gauge M Steel Black Ant
Inner Diameter: Front to back 9 inches (approx)
Ear to Ear: 8 inches (approx)
Circumference: 27 inches (approx)
Size: standard size fits almost all adults
Other: Please use Helmet cotton cap for comfortable wearing, and use Helmet Stand for the good protection of helmet. We supply this helmet pre oiled for protection from rust. Use this helmet as a great Halloween costume.