The Della 3 seat sofa set is made on aluminium frames and requires no assembly. All the frames have welded joints and are also powder coated. You can simply unpack and use straight from the boxes. The wicker is also UV treated to ensure it will not fade or become brittle in the sunlight or when exposed to the cold. This furniture is completely weather proof and can live in the garden all year round without the need to cover it. As with all Signature weave products we offer a 5 year guarantee on the frames and the wicker.