Each track consists of a ball that comes rushing around a closed track like a roller coaster. The special "peek-a-boo" lid stimulates the cat to chase and smack the ball, providing hours of entertainment.It's easy to assemble the tracks, just pair up two pieces and press down until you hear a soft click. To take apart, pull back the tabs on one end and pull. The lid can be removed in a similar way.Senses 2.0 Circuits can be built and rebuilt into different shapes runti the house. Surprise your cat with a new arrangement every few days to keep the experience fresh and exciting.Senses 2.0 Circuits are available in three different sets:Play Circuit is at ground level which is great for getting high speeds.Wave Circuit has elevations for more different movements.Super Circuit is the ultimate combination!Facts about Catit Senses 2.0 Wave Circuit:The ultimate cat toy that provides hours of entertainment.Works great on its own or in combination with other products from the Catit Senses 2.0 se