Riddell - AMP Alternate Helmets are Here! Our new, distinctively fresh, yet familiar alternate helmet collection adds a colorful twist to your favorite NFL team helmet. Amp Alternates utilize different color schemes for the shells and facemasks with a unique paint technique that gives the colors a distinctive glow. A must-have addition to any collection! Speed Revolution mini helmet, with Aerodynamic Shell, G2BR facemask, interior padding, and a 4 pt. chinstrap. Official shell colors and over sized decals. The most popular collectible helmet in history. The cornerstone of collections everywhere. The ideal autograph helmet. Approx. 5" tall.