Modular garden greenhouse offered by professional factory 1. Panels: 4mm or 6mm PC 2. Frame: Alloy,1mm thick 3. Many designs Modular garden greenhouse offered by professional factory1. Panels of greenhouse: 4mm Polycarbonate(PC), 5-year warranty (6mm is optional), Strong and weather resistant, unbreakable, clear, 200 times stronger than glass PC blocks out 99.9% of harmful solar UV 2. Frame of ...