Big Ten Conference Mini Replica NCAA College Football Helmets. Big Ten Conference includes the following teams (11 Helmets) - ILLINOIS, INDIANA, IOWA, MICHIGAN STATE, MICHIGAN, MINNESOTA, NORTHWESTERN, OHIO STATE, PENN STATE, PURDUE, WISCONSIN. Big Ten Conference Mini Replica helmets are perfect items for autographs and collectors. The Mini Replica helmet comes with Official Big Ten Conference NCAA College team decals, interior foam padding and a chinstrap. NCAA Big Ten Conference Replica helmet size is 6(L) x 4.5(W) x 5(H). NCAA Big Ten Conference Mini Replica helmets ships by UPS.