NCAA Northwestern University Replica Mini Speed Style Wildcats Helmet Based on one of the most popular onfield designs, this collectible Speed Mini football helmet is made specifically for fans. At approximately 5.5 inches tall, this halfscale display helmet is perfect for all football fans and great for autographs. The helmet features a mini size Speed shell, the S2BDSWSP face mask, a 4point chinstrap, and official paint and decals. The perfect collectible or gift Made by Riddell. Specifications. Color Purple. Team Name Northwestern University. League NCAA. Height 9 in.. Width 9 in.. Depth 9 in.