INTERMEDIATE LEVEL2 FUN: Challenges your dog's mind. Interactive treat puzzle works your dog's mind & reduces boredom/destructive behavior. Great for dogs who have mastered level 1 puzzles. NON-REMOVABLE PARTS: Safe & easy to clean. Remove it after the treats have been eaten. DURABLE COMPOSITE WOOD DESIGN: Built to last with a non-slip base & a unique plastic/wood composite - BPA, PVC & Phthalte-free: Brand: Nina Ottosson by Outward Hound