Inner Diameter : Front to back 9. Use this Helmet as a great Halloween Costume. The item "Medieval Set of 3 Reenactment 300 Greek Spartan Movie Armor Helmet Replica" is in sale since Friday, May 1, 2020.This item is in the category "Collectables\Blade Accs, Armours & Shields\Armour & Shields". The seller is "affordablegiftsmart" and is located in haridwar. This item can be shipped worldwide.