This is a 25m long roll with a 8mm² nominal area. With 8mm cables, you get little voltage drop compared with lighter cables. This twin core copper cable has a twin sheathe design meaning that the outer jacket protects the actual wires when running down chassis rails, through firewalls and down to caravans and camper trailers etc. The outer sheathe provides further protection to the cables and makes it easier to run through the vehicle. This cable can be used for your caravan, camper trailer, electric brake controllers and dual battery systems etc.