Shop for Copoly sheets for O&P. Copolymer polypropylene (Copoly) sheet for the O&P market is used in many of the same applications as homopolymer polypropylene (body jackets, upper and lower extremity orthoses), but where slightly more flexibility is needed. Custom cuts and cut-to-size pieces. Polypropylene comes in many colors and sizes. Stocked materials typically ship in 2-5 business days. Can’t find what you need? Get a quote.