Whether it's the flat surfaces or the cracks or grouted areas between them, the stiff 1-3/8" long brass-plated steel bristles will scrub them clean of all moss, debris, grass or weeds. The handles are 53" long. The flat-scrubber is 1-1/2 x 6" and the 3-1/2" long pointed crack-scrubber section is only 1/8" wide at the end - allowing great pressure. Every homeowner who has seen them has wanted to steal our samples. Air shipping not available for complete scrubbers.