"1/2 INCH DIAMETER, OPEN END, HOG BRISTLE, TWISTED WIRE HANDLE, PIPE CLEANING BRUSH; BRISTLE IS NATURAL COLOR, STIFF, RESILIENT HOG BRISTLES OF UNIFORM LENGTH, AND IS CLEANED AND STERILIZED; WIRE IS BRASS, ZINC-COATED STEEL OR CORROSION-RESISTANT STEEL; BRUSH HEAD SHALL BE LOCATED EQUAL DISTANT FROM THE ENDS; THE HANDLE END OF THE TWISTED WIRE HAS A LOOP AND THE OTHER END OF THE WIRE IS TIGHTLY TWISTED TO A ROUNDED, SMOOTH END"