The bird cup fits all bird cages, including vertical and horizontal bars, thanks to its clever screw-on design. This makes it a versatile accessory that can be used with a variety of cage types. The cup is constructed with durable materials and is dishwasher safe, making it easy to clean and maintain. This ensures that your bird always has access to fresh, clean food and water.The JW Insight Clean Cup Feed & Water Cup for birds is designed for easy attachment to any bird cage, and can be quickly removed and refilled to ensure a clean supply of food or water. The cup is also easy to clean, making maintenance a breeze.The small size of the JW Pet Insight Clean Cup Feed & Water Cup is perfect for parakeets, canaries, and other small birds. This size is designed to accommodate the specific needs of these smaller birds, ensuring they have a comfortable and enjoyable eating and drinking experience..