Medium stiffness bristle is a perfect, cost-effective tool to have for cleaning a of applications. Use with variable speed drill for maximum cleaning control. perfect work for cleaning boat/marine hulls, tires, grout/tile, tubs/showers, siding, ceramic floor or carpets. High speed rotation of the drill combined with high quality premium medium duty bristle brush lifts and easily extracts spots from leather and fabric upholstery or carpet. recycle used multiple times- the Brush are made of nylon bristles ,easy to rinse clean and they will for next use again. Perfect for more tasks. Saves your cleaning time and more fun. only. Drill is NOT included. Package include 4 different sizes and shapes of brushes for cleaning around angles of your bathroom,1/4 inch shaft fit for most of power scrubber drill. Please note: Combine the spinning action of a drill with the cleaning power of a brush. Simply attach to your drill and let the do the work . The bristles are made from durable nylon fiber to scrub strong and last long. Each color corresponds to a different bristle hardness level. This Medium Duty can be applied to the following places: for bathroom surfaces tub for shower for tile for grout drill prowered cleaning brush for pool tile Scrub Brush for flooring nylon bristles for sinks colour:Green, yellow Material:Plastic, nylon Package Contents: 1 * 2 inch 1 * 3.5 inch 1 * 4 inch 1 * 5 inch Yellow hollow brush 1 * 5 inch Round brush Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.