Feature:1. This product is mainly composed of 3 parts: primary coil, secondary coil and soft iron core.2. Mainly used in middle school physics to demonstrate electromagnetic induction and verify Lenz's law.3. Sensitive enough, it is an indispensable experimental equipment and teaching instrument.4. Made of selected high‑quality metal materials, sturdy and durable, wear‑resistant.5. Physical electromagnetic induction coil kit, stable performance and easy to use.Specification:Item Type: Primary Secondary Coil SetMaterial: MetalModel: 24010Primary Coil: 200 TurnsInner Diameter: Approx. 11mm / 0.43inOuter Diameter: Approx. 15mm / 0.59inSecondary Coil: 370 TurnsInner Diameter: Approx. 24mm / 0.94inOuter Diameter: Approx. 30mm / 1.18inPackage List:1 x Primary Coil1 x Secondary Coil1 x Iron Core StickNotice: