A bicycle made almost entirely of cardboard has the potential to change transportation habits from the world’s most congested cities to the poorest reaches of Africa, its Israeli inventor says. Izhar Gafni, 50, is an expert in designing automated mass-production lines. He is an amateur cycling enthusiast who for years toyed with an idea of making a bicycle from cardboard. Cardboard, made of wood pulp, was invented in the 19th century as sturdy packaging for carrying other more valuable objects, it has rarely been considered as raw material for things usually made of much stronger materials, such as metal. Once the shape has been formed and cut, the cardboard is treated with a secret concoction made of organic materials to give it its waterproof and fireproof qualities. In the final stage, it is coated with lacquer paint for appearance. In testing the durability of the treated cardboard, Gafni said he immersed a cross-section in a water tank for several months and it retained all its hardened characteristics. Once ready for production, the bicycle will include no metal parts, even the brake mechanism and the wheel and pedal bearings will be made of recycled substances. The cardboard bike should cost no more than about $20 to buy. The cost of materials used is estimated at $9 per unit. Once the bike wears out, which it is estimated at a year after of ownership, you can easily return the bike for recycling.