A highly durable professional grade full-face bump head with auto winding technology (eliminates the need for spools). The head has superior performance and can withstand the extreme demand of any job. It can hold up to 26 Ft. of trimmer line (with diameters ranging from 0.080in. to 0.105in.). With it's auto winding technology, you never have to open the head, simply line up the arrows on the bump knob, insert the line, and crank. It provides the continuous cutting benefit of a bump head without having to open the head or deal with tangling spools.