These are some cardboard version of "Aggresive In-Line Skates" which if you don't know are the kind that are used on skate parks. These are finger versions that can be used on mostly anything especially Tech Deck ramps. They took me about 4 hours to make but where fun and worth it when they were done
They do actually roll and grind really well!
If you want to make them you'll need these materials:
fairly thick cardboard
any card like a gift card
wheels from a tech deck
bearings from a tech deck (the rod that you put in the wheel)
Any way follow to see the next things I make.