Mustang® Seamless aluminium gutters are roll formed on site in lengths of up to 30 metres. It is a unique system with no joints, meaning no leaks, creating a neat, maintenance free product of the highest quality, giving you peace of mind and the added extra of the visual appeal of smooth neat lines. Manufactured from a minimum of 78% recycled aluminium, which can be further recycled once it has reached the end of its useful life – it really is an environmentally friendly product. Mustang® gutter system. The only aluminium seamless gutter system approved by the BBA.