Perfect for hands-on number and counting activities as well as classroom management needs such as labeling spots with student numbers. Easy-to-clean, resource provides a revolutionary hands-on learning experience for both at home or in the classroom. The innovative silicone material is easy to clean, quiet, durable, and clings to all nonporous surfaces without leaving any residue. It's dishwasher safe so you can sanitize regularly and easily. You can even write on it with dry-erase markers! Each manipulative measures 3.54" in diameter. 30 pieces. Ages 5 and up.