Treat Ringer Taco is a new chewing challenge with multiple difficulty levels. This durable and challenging design is available in three sizes, and each has multiple difficulty levels for treats. Large has two hard treat openings, one medium, and one easy. Medium has one each hard, medium, and easy treat opening. Small has one each medium and easy treat opening. Use with USA-made Edible Treat Rings. Chewing action helps clean teeth. The toy floats in water for retrieval play. Dishwasher safe for easy cleaning.