Aluminum Oxide Abrasive Urethane Foam Sponge. Use On Wood, Metal, Plastic, Drywall, And Painted Surfaces. Conforms To Corners, Irregular Surfaces, Hard-To-Reach Contours, Wood Trim, And Spindles. Rinse Clean And Use Again. These Are Complete Line Of Heavy-Duty Shop Products That Will Bring You Years Of Reliable Performance.