VEIKOUS 24 in. x 48 in. x 0.16 in. (4 mm) Polycarbonate Sheet Panels UV- Resistant (14-Pieces) PG0101-16 - The Home Depot
Amazon.com: Polycarbonate Sheet - 12" x 24" - 4.5mm thickness - Good Glass Alternative used in POP Signs/Displays, Skylights, Pool Enclosures, Machine Guards - UV Stabilized, Low Flammability & Burglary-Resistant : Industrial