NYLON BRUSH - Nylon bristles safely clean soot from metal stove pipes, flue, and chimneys GALVANIZED STEEL STEM - Heavy duty single-spiral stem for long-lasting durability 1/4"-20 FITTINGS - Features 1/4"-20 male threads for use with our flexible poly rod kit (sold separately) HEAVY DUTY BALL TIP - Guides brush through vent pipe offsets and bends MADE IN USA - Quality manufactured in the Midwest! Pellet Stove Vent Brush is made with poly bristles and a heavy-duty ball tip to guide the brush through vent pipe offsets and bends. Long lasting and perfect sizing allow thorough cleaning of a pellet stove pipe.