1. Material: plastic/electronic components
2. Accessory set: 73 pcs
3. Use battery: 1 x AA battery (not included)
4. There are letters behind the track to distinguish
5. Smooth and not thorny
6. The lock structure is conducive to a firmer track connection
7. Assembly size: different combinations and different sizes
8. Packing size: 38x5.5x24cm
9. Weight: about 770g