A crunchy supply of chewtime veggies, Simple cage attachment, Works with horizontal cage wires, Position at a level easily accessible to your pet, Place the washer outside of the cage and tighten with wingnut, Size approx: 6, 75in x 2, 5in x 4in Safe for Pets to Chew Helps Overcome Boredom USDA Approved Food Colors SKU: RNRDST0902