... , twin-wall polycarbonate Sheet Greenhouse Size: 70x130x62cm1 Material: High quality aluminium frame and galvanized steel base, Polycarbonate ... and flexural strength, which ensure durability for greenhouse, UV-Protections.3 Single or double ... your greenhouse.6 There are many sizes of greenhouse, mini-greenhouse, medium-greenhouse; big size greenhouse.7 Accept customized design. cold-frame greenhouse