Catit Design Senses Super Roller Circuit takes fun and action to breathtakingly new heights. This large 8-piece circuit has alternating high and low sections with an enticing motion-activated illuminated ball the zips around inside, enticing cats to chase and swipe at it. There are large openings along the circuit that allow curious felines to safely reach in and touch the ball. It's the ultimate exercise stimulator for cats. Key Features Super Roller Circuit for cats takes fun and action to breathtakingly new heights Large 8-piece circuit consists of alternating high and low sections Motion-activated illuminated ball lights up and zips around inside the track like a crazy roller coaster, enticing cats to chase and swipe at it High-low circuit design propels ball at high speeds.