Dear customer, if you have any questions after receiving the goods, please feel free to contact us. We will handle it as soon as possible. Thank you for your support. Features: Magnetic Track Design: Build endless layoutsstraight tracks, curves, slopes, and even vertical sections. Strong 360 magnetic force lets the trains run uphills, downhill, and upside down for exciting play. Easy to Assemble, Store & Play: Quick-snaps track pieces make setup and cleanup simple. Detachable design is perfect for storage and travel, ideal for solo-fun or parent-child activities. Safe, Sturdy & Perfect Present: Made with quality, child-safe materials and strong magnets. Great for developing creativity, coordination, and problem-solving. An ideal present for birthdays, holidays, or special occasion. Rail Cubes Magnetic Monorail Set offers an expanded block collection for more intricate and complex track designs. Create multi-level routes, and imaginative twists, while the mini trains glides effortlessly along the tracks for an engaging and dynamics play experience. PERFECT PRESENT FOR KIDS: A fun, educational toy that grows with your child. Preschoolers can develop hand-eye coordination by building a basic-road system, while children over 3 years old can use the magnetic track to create more complex patterns. It is a great present for birthdays, for Easter, for Christmas, for Thanksgiving or other holidays. Notice: 1.Actual color may be slightly different from the image due to different light effect 2.Please allow 1-3cm deviation due to manual measurement Description: Specifications: 123pcs, 81pcs, 51pcs