Vinyl (PVC poly vinyl chloride) is relatively easy to manufacture and comes in many different materials, is not “archival safe” and the tooling/dies are easy to make. However polypropylene has to be sealed on special equipment, the tooling/dies have to be designed and made on CNC Milling Machines and can be expensive. Polypropylene is “archival safe” and recyclable. Rochester 100 can manufacture both types of materials.