A. Dual functions: The double - layer composite donut/circular design can meet the needs and desires of cats to play in holes, bringing endless fun to cats. The dome - concave design provides a resting place for another cat, allowing two cats to use it simultaneously without interfering with each other. B. Felt material: The cat tunnel bed is made of carefully selected felt materials. It is wear - resistant, scratch - resistant, and less likely to pill, satisfying the natural instincts of cats to scratch and rub. This is a cat bed suitable for all four seasons. C. Spacious interior: For the small size, the outer diameter is 50 cm/19.68 inches, the inner diameter is 18 cm/7.08 inches, and the height is 20 cm/7.87 inches. For the large size, the outer diameter is 60 cm/23.42 inches, the inner diameter is 19 cm/7.48 inches, and the height is 28 cm/11.02 inches. It is suitable for all four seasons and features a detachable and washable design. D. Zipper separation design: You can clean every corner inside the tunnel, ensuring a clean and comfortable playing environment for your cat. The simple assembly method makes it easier for us to take care of our cats. E. Pet gift: Due to its circular design which adds a sense of novelty and provides more hiding places, it can be a good choice as a gift for friends who own cats, small dogs, kittens, rabbits, and other small animals. Specifications: - Material: Felt - Colors: Black, pink, blue, gray - Sizes: Small size - outer diameter 50 cm, inner diameter 18 cm, height 20 cm; Large size - outer diameter 60 cm, inner diameter 19 cm, height 28 cm - Weights: 680 grams, 1180 grams - Package contents: 1 pet nest