NFL 75 Years Throwback Pocket Pro football helmet. These little helmets are about the size of the “bubble gum-machine” helmets. However, they are much higher quality. The exterior of these pocket size helmets will dazzle every fan with their incredible brilliance.The interior is lined with PVC padding. Approximate dimensions are: 2 1/4″ long x 1 7/8″ wide x 1 5/8″ high.