The Amphibious Roller is 2.5 inches wide and 4.5 inches across creating a new way to play fetch in the pool, lake, or on the beach. Perfect for water-loving canines, it was made to satisfy their natural chase instincts in land or water. Features a lightweight EVA foam core, the Chuckit Amphibious Roller floats high on the water and won't pop or sink, all while being gentle on your dog's teeth as they fetch. Featuring a high contrast, soft but durable nylon shell, the Amphibious Roller can withstand the harshest fetch conditions.