Pallet names are derived from how they are made. Stringers made of 2" X 4" wood, plastic, or metal are used to construct stringer pallets. Block pallets, which feature both parallel and perpendicular stringers, are often more durable. It is inception in the years following World War 2, Pallet Market pooling has grown in popularity. It often takes the form of pallet rental, pallet hire, or alternatively, pallet exchange, as done in the EPAL system. Instead of paying for the pallet completely, pallet users who rent them can use a high-quality pallet for a price that is only tied to their use of it. In this way, pooling can eliminate the need for disposable pallets, lowering travel costs while removing solid waste and improving operating efficiency throughout supply chains.