The HPI Nano-TTR Interlocking Curb Set is designed to help you build custom Nano-TTR tracks on almost any flat surface. Each curb features a silicone backing that grips securely, keeping your layout stable during racing sessions. They also work seamlessly with HPI's Nano-TTR Track Mats (HPI160988 or HPI160989 - sold separately), giving you flexibility whether you're setting up a temporary course or planning something more permanent. Plus, a built-in mounting hole on every curb allows you to screw them down if you prefer a fixed layout.