Kids Race Track Building Set (51 or 81 pcs) | USB Rechargeable | Durable ABS | STEM Skills + Motor Control | Ages 3–5Build, rebuild, and race againthis track set combines hands on fun with STEM style problem solving for kids ages 35. About the product: A customizable kids track building set with 51 or 81 pieces, designed for creative layouts and repeat play. Made from durable ABS and built around a USB rechargeable powered component for continuous play sessions. Benefits: Encourages problem solving and spatial reasoning through building different track designs