This insert is designed to fit the large TROFAST storage box from IKEA that measures 16.5" x 11.75". Made from black acrylic. This insert is specially designed to fit ping pong balls, but can be used to sort all types of sensory play items. Use as a light table for elevated play. *SAFETY WARNING* *Please be aware that small accessories are not recommended for children under the age of 3 and those who are still mouthing due to choking hazards. Children of all ages should always be closely supervised when our products.