These small, polycarbonate greenhouses are light enough to be moved around yet stable enough to last for many years. The frames are made from treated pine and all joints are reinforced. They are a very sturdy unit. They can be made to almost any size to suit your needs. The one illustrated is 1030mm x 540mm x 760 high external dimensions and 1000mm x 500mm x 450mm high internal dimensions. They can be made with a hinged or removable lid. We use Suntuf polycarbonate miniorb on all of our greenhouses.