Missing the most crucial piece to your Iron Man suit, the Iron Man helmet? This is the Jaw (Large) of the helmet, part 4 of 4 parts that you will have to order separately for a complete helmet. Additional parts you will need to order are; Iron Man Helmet Head Left Large, Head Right Large and Face Shield Large. The way you attach them is up to you, (magnets, hinges, clips). Designed to print at a thickness of .72mm, (minimum for Strong Flexible Plastic is .7mm). This saves on printing costs and WILL need some reinforcement on your end. Most people use fiberglass resin. WARNING: Please take measurements before ordering to be sure the helmet will fit, I can't guarantee that this will fit everybody even though it is considered a large. Measure the width of your head compared to the width of the opening at the bottom of the helmet.