4mm Clear Polycarbonate Roofing Sheets Greenhouse 2ftW x 4ftL - 61cmW x 122cmL - Decoridea. 4mm Clear Polycarbonate Roofing Sheets Greenhouse 2ftW x 4ftL - 61cmW x 122cmL. Polycarbonate Sheet is stronger and lighter than most glazing material, installation is easier and less structure support is required.
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