in 2008, phil bridge created a cardboard bicycle as part of a three-year degree course in product design at sheffield hallam university. it was intended to discourage theft, supports a rider up to , and is constructed from a structural cardboard called hexacomb. it is waterproof, but is only expected to survive six months of constant use. the drivetrain and brakes are metal, as on a conventional bike, and it rolls on standard pneumatic tires.