Miami Dolphins 1997-2013 NFL Riddell Mini Speed Throwback Football Helmet. The ultimate NFL mini speed football helmet collectible, perfect NFL mini speed football helmets for autographs and collectors. Mini Speed Football Helmet with great graphics. Official NFL Mini Speed Football Helmet with official NFL team decal. ABS plastic Mini Speed Football Helmet shells with plastic facemask. Realistic interior foam padding, vinyl-leather chin strap. This is an affordable NFL football helmet for the true fan. Size: 1/2 scale versions of NFL football helmets. Size: 6"(L), 4_"(W), 5"(H) - (NOT FOR WEARING).