NFL Z2B Riddell NFL Replica Throwback Mini Helmet. The greatest throwback miniature sports collectible ever! Approximately 1/2 scale versions of NFL helmets. ABS plastic shells with plastic facemask and authentic-looking throwback team decals. This helmet has become a staple in the collectibles market for several good reasons. It's affordable, doesn't take up too much room and showcases an autograph like nothing else! Once you start your collection you'll be hooked!