Carlisle synthetic flo-thru brush. Each brush has one threaded flo-thru handle hole. Excellent for cleaning greasy surfaces from kitchen walls, equipment, even vehicles. Soft Nylex(flagged) bristles set in non-absorbent plastic blocks that won't crack or chip. 40050 has rounded block to help protect painted surfaces and delicate trim. Base resins used to produce blocks and bristles are made of FDA approved material. Made in USA. Block and handle material: plastic. Flo-Thru design delivers a constant flow of water. Densely filled with vinyl bumpers to protect vehicle finishes. Handles sold separately.