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 1/2 in x 50 ft, Aluminum EMT conduit.