Custom-designed for use with our Parts of the Animal Cards (RC20 to RC28) and Parts of the Plant Cards (RC29 to RC30). Each section has plenty of room for fingers to remove cards. When you make other classification sets, mount them on cards to fit this wooden tray. Hardwood, with a clear lacquer finish. 12" x 9" outside; compartments are 5½" x 8½", 5½" x 5¾", and 5½" x 2¼.