Crystal Blend Greenhouse Kits are an ingenious greenhouse offering the gardening enthusiast a precise balance of 2 advanced polycarbonate panels and a strong, durable, rust-resistant aluminum frame, perfectly designed to fit smaller spaces so you can start growing earlier and continue growing later. The twin-wall roof panels block up to 100% of harmful UV rays and diffuse direct sunlight; the crystal-clear side panels offer over 90% light transmission. Strong and attractive, this Crystal Blend Greenhouse kit provides years of maintenance-free gardening enjoyment.