Thiscat Tunnel for Indoor Cats features an internal swinging ball to boost interaction and provide exercise through chasing, hiding, and resting, adding excitement to your cat's daily routine. - Portable and space-saving design: collapsible and easy to store; travel-friendly so you can take the fun with you and keep your cat active on the go. - Stable and durable construction: built with ultralight steel wire and high-quality polyester to endure play and prevent collapse, ensuring safe, engaging fun. - Expandable options: unique button connection allows linking extra tunnels for a larger play area and a more stimulating environment. - Use scenarios: - In a small apartment, set up in the living area for quick bursts of play and mental stimulation. - While traveling or visiting family, the foldable design makes it easy to bring and keep your cat active. - In homes with multiple cats or high activity, connect additional tunnels to create varied routes and extended play space.