Ribbed interior design to reduce friction and provide a wire pulling experience on par with traditional EMT but without messy lubrication. Aluminum EMT has various benefits: lowering costs and increasing profits; lightweight compared to steel alternatives; non-corrosive, non-sparking, non-ferrous; manufactured from recycled Aluminum, making it a green product. This is a 3-1/2in x 10ft Aluminum EMT conduit.