The Glasgow cleaning brush is made of fine white natural bristles and is available in four grades of stiffness: Extra Soft, Soft, Medium and Hard. These brushes have a dense 4 by 28 row bristle pattern with a bristle length out of 1". The brush section is 5" in length by 5/8" in width. The bristles are set in a hard wood handle that measures 3/4" wide by 10" long. Made in Germany.