Plastic holder (4.5" x 2.5" x 2") holds chipboard box and insert. Use as is or fill with treats or other foraging materials of your choice. Complete system includes 10-day supply (10 refills).Parrots must chew box to find reward. Compartmentalized chipboard makes parrots eagerly learn that they must continue working to expose additional treats. US-made food-grade paper box, contains no glues. High impact polycarbonate plastic holder.