Clear Hemispherical Bump Dots (Round with Rounded Tops) Size: Small (.250 Diameter x .062 High) Count: 578 Why use Bump Dots? Bump Dots for the Blind and Visually Impaired are a great way to tactually mark buttons on appliances and electronics computer keyboards TV s and remotes copiers printers etc. Use them at home or in the office for marking a countless variety of items. Made of durable soft plastic these tactile dots have a self-adhesive backing for fast easy application on most hard clean surfaces (plastic metal etc.) Adhesive will not damage the product s surface.