FILLER IS EITHER 100 PERCENT HOG BRISTLE OR POLYPROPYLENE; ONE PIECE CURVED BLOCK IS EITHER WOOD OR IMPACT RESISTANT PLASTIC; BRUSH BODY IS 1-1/4 INCH WIDE AND 5-1/2 INCHES LONG WITH FOUR ROWS OF 1 INCH (EXPOSED LENGTH) BRISTLES; MEASURES 13 INCHES LONG OVERALL