Ohio State Buckeyes Authentic Speed Football Helmet. Perfect item for autographs and collectors. This full size Ohio St helmet is designed with extended mandible (jaw area) protection, a steel polyvinyl-coated face mask, chin strap, increased padding, an integrated facemask attachment system and elliptical air vents. NCAA Team name on back bumper. The officially licensed Ohio State Buckeyes helmet is great for autographs and features Buckeyes team logo decals on both sides. The striking shape of the future. NCAA Buckeyes Authentic Revolution Speed helmet size is 13.5"(L) x 9.75"(W) x 10.25"(H). NCAA Ohio State Buckeyes Full Size Helmet.