Flat speed track with special peek-a-boo cover:- 25 cm (10”) longer than the original Play Circuit and enables 100 layouts!, Full Senses 2.0 and backward compatibility, No need to track down stray balls around the house, Includes rattle ball with bell, Easy to assemble and clean, Made of BPA-free materials, https://catit.co.in/product/senses-play-circuit/