With these transparent sheets, you can not only build up a better growing environment for your plants but also own a more durable greenhouse. Made of polycarbonate, the shatterproof sheets are excellent in heat retention and light transmission. Its notable that the panels are 4mm thick, its cellular design allows air in and makes them thermal-insulating.(Tip This item requires assembly Living and Home 14 Pieces Clear Polycarbonate Sheets for Greenhouse Covering