Features: 100% brand new and high quality Made of high quality aviation aluminum, very durable and light weight. Intellectual development: learn about amazing physics laws and science facts in our Universe. It is much more exciting to actually see and feel the process instead of only hearing theory and numbers. Magnetic - Stack them together and discover more ways to play. You can flip it, slide it, spin it and fidget any way you like. A great way to keep focus, help reduce stress and anxiety. Perfect device for school, work, meetings, church, libraries and more. Function: stay focused, relieve stress, release internal creativity and imagination. How it works: Slider moves along the magnets 1. Crossing their magnetic field 2. Inducing electric current with opposite magnetic field 3. Creating resistance that slows down the slider. Specification: Material: Aviation Aluminum Size: app. 68x15mm(2.68x0.59in) Color: Silver Quantity: 1 pc Note: Transition: 1cm=10mm=0.39inch No retail package. Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1 x Moon Drop(other accessories demo in the picture is not included.)