Kyosho No.87031-02 MINI-Z Grand Prix Circuit 30 Large Corner Expansion Kit 12pcs. allows you to expand your existing MINI-Z Grand Prix Circuit 30 track with large corners, providing you with even more layout options and racing excitement. The kit includes 12 pieces, including mats, circuit barriers, and joints, allowing you to create various track configurations. The mats have a smooth surface on one side and a rougher surface on the other, providing different levels of grip. The circuit barriers help prevent cars from leaving the track, ensuring a safe and exciting racing experience.