Sunnytech Metal Precision Gyroscope Child Educational Toy TL001 (Silver) Stirlingtechonline is exclusive distributor and the owner of the brand "SunnyTech"----Please be sure you receive an authentic SunnyTech stirling with SunnyTech logo and only sold by Stirlingtechonline to ensure 1-year 100% Satisfaction Guarantee. ATTENTION before puchase and usage.***DISCLAIMER:The Plastic pull string may get JAMMED between the shell and the gear IF NOT SUITABLE USAGE. It's not quality problem, if this jammed will perplex you, please give up the purchase or return the product with reason "Unwanted item"***Tips on use Plastic pull string to avoid break and JAMMED***Be sure the plastic pull string gear bites the Gyroscope gear, and pull in vertical gently initially to familiar the usage. If pull plastic pull string obliquely and violently, it will easy jammed and break the plastic pull string.A great toy for children and physicists of all ages. Years of enjoyment and experimenting. Size: diameter 65.3mm, 91.5mm heighth.Balance on spindle, pull with included string, and watch it spin. Material: please check details in gallery. Sturdy metal gyro and plastic spindle. Smooth spinning mechanism. These things don't work unless you get them to spin fast.*****Check Gyroscope playing video here http://goo.gl/dPxcix Suitable for 6 years and upwards. WARNING: CHOKING HAZARD - small parts. Not for Children under 3 years.