Carlisle 36532003 Swivel-Head Grout Line Brush, 1-1/4"-Long Black Crimped Nylon Bristles, Blue Block, 7-1/2" L x 1" W (Case of 12) Cleaning brush scrubs tile and grout to remove mold and mildew buildup Socket accepts a handle (sold separately) for upright scrubbing and swivels for maneuverability and control Durable nylon bristles are crimped and beveled, and maintain their shape well BPA-free to address safety concerns raised by FDA and other organizations Bristles are 1-1/4-inches long, and the overall brush dimensions are 7-1/2 x 1 inches (L x W)