2/4PCS 21X22MM Magnetic Levitation DIY Full Copper Coil Large Outside Diameter Large Thrust Coil Experiment Coil Description: New And High Quality. Features: Made Of High Quality Copper Material,Durable. When A Current Is Passed Through The Coil,A Magnetic Field Is Generated Around The Coil. This Additional Magnetic Field Can Generate An External Force To The Upper Permanent Magnet,Or Push Or Suck. By Adjusting The Magnitude And Direction Of The Current Flowing Through The Coil,The Force Can Be Adjusted To Generate Stable Magnetic Suspension. Suitable For Magnetic Levitation Above 800G. Note:Magnetic Levitation Coil Only,Magnetic Levitation Is Not Included. Specifications: Material:Copper Color:As Shown Electrical Inductance:6.7MH Inner Diameter:9MM(0.35") Wire Diameter:0.45MM(0.01") Height:22MM(0.86") Outside Diameter:21MM(0.82") Package Include: 2PCS X Magnetic Levitation Coil OR 4PCS X Magnetic Levitation Coil Note: 1. Please Allow 1-3 CM Error Due To Manual Measurement. 2. As Different Computers Display Colors Differently,The Color Of The Actual Item May Vary Slightly From The Above Images,Thanks For Your Understanding. _x000D_