new and high quality,Made of high quality magnet. easy to use: Just place the card on the of the magnetic material and it reveal a magnetic field of pattern. Great for personal or scientific research. And it help us study magnetic fields that 't see. Application: Good performance, convenient and practical, suitable for home and professional use. Size: Portable and small size, easy to store and carry, bring you convenience. Colour:Green Material:Magnet Paper Size:40x45mm Package Contents: 1 x Magnetic Field Viewer Viewing Film Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.