On this website you will find a little bit and pictures of the helmets which I used.

This website will also show you a bunch of pictures and give you some detail on the helmets.

This site goes over a wide variety of helmets and different kinds of injuries

This business also creates its own helmets

This site describes how it was back in the day when we didn't have the advanced helmets we have today

This site goes on about how each helmet would help prevent head injuries