Bump Dots are a great way for the blind or those with visual impairments to tactually mark countless items throughout the home and office. They make it easier to identify and operate the keyboards, keypads, and control panels on all of your appliances and electronics. Apply these visual aid dots to everything from computers to keyboards to telephones, kitchen appliances to washers, dryers, and more. Clear soft rubber vision impairment dots have a unique feel, with a large indented outer ring and a raised dot at the center. The shape makes them easily distinguishable by touch from standard round dots. For use on any clean flat surface. Measures .50" d x .20" h.