Montana Grizzlies Mini Speed College Football Helmet. The collectible NCAA University Mini Speed Football Helmet, perfect for NCAA autographs and collectors. Mini Speed football helmet with great graphics. Official NCAA Mini Speed football helmet with official NCAA team decal. ABS Plastic Shells Mini Speed Football Helmet with Plastic Mask. Realistic inner foam padding, vinyl skin chin strap. This is an affordable NCAA football helmet for the true fan. Size: 1/2 scale versions of NCAA football helmets. Size: 6 inches long, 4½ inches wide, 5 inches high - (not for use).