The Carlisle 363883104 scrub brush with yellow bristles swivels onto its side for maneuverability onto walls and into corners and hard-to-reach areas. The white block is made of plastic and has a threaded swivel socket that accepts a handle (sold separately). The bristles are yellow, 1" long, and made of polyester, which offers abrasion and chemical resistance, shape recovery, and extended life. All brush material is free of BPA (Bisphenol A) to address safety concerns raised by the U.S. Food and Drug Administration (FDA) and other organizations. Brush measures 8" long and 3-1/2" wide.