Oklahoma Sooners Riddell Mini Football Helmet. The ultimate NCAA college mini football helmet collectible; perfect NCAA college mini football helmet for autographs and collectors. Mini football helmet with great graphics. Official NCAA Sooners mini football helmet with official NCAA team decals. ABS plastic mini football helmet shell with plastic facemask. Realistic interior foam padding, vinyl-leather chin strap. This is an affordable NCAA Oklahoma Sooners football helmet for the true fan. Size: 1/2 scale versions of NCAA football helmets. Size: 6" (L), 4 1/2" (W), 5" (H) - (NOT FOR WEARING).