Display and organize with this 25 Cubby Cube Insert for your Cube Storage Organizers. It comes in 8 pieces, is very easy to assemble and does not require any tools. You just slide the 8 boards together and you're done! Each divider has 25 cubbies. The opening sizes are listed in the 3rd picture. We make our 12 Cubby Cube Inserts for the following brands of cube organizers. Please see 2nd picture for dimensions of each cube. 1. Better Homes and Gardens Cube Storage Organizer 2. Thresholds/Brightroom Cube Organizer Shelf 3. IKEA Kallax Shelf Unit FINISH OPTIONS: Unfinished: MDF (medium-density fibreboard) which is 1/4" thick and a brownish color. Very strong. Because they are made of a natural material, the color and appearance of each piece may slightly vary. Our MDF organizers & inserts are unfinished. We are not responsible for any alterations made to these by the customer.