Material: Plastic Spinning top Size: about 8.5*6.5cm Transmitter size: 7.3*5cm with light and music effects Function: stimulate children's interest, cultivate and develop children's hands-on ability. Special attention: when the top is winding, use some strength to make the transmitter and the top stick together, twist it, don’t twist it too much, the transmitter is easy to be broken if you twist it too much. there will be some paint gyros. This is normal and does not affect the use of lights.