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Clearly word the patterns of the magnetic field. Place the film as shut as possible to the magnet/item to monitor the sample changes. Reusable and automatic recovery. The stronger magnets, the better the results. Product Name: Magnetic Paper/Magnetic Field Viewing Film /Magnetic Field Viewer/Magnetic Field Demonstrator color:Brown yellow Material:Magnetic Nanoparticles size:10 x 10cm Package Contents: 1 x Magnetic viewing movie Only the above package content, varied merchandise should not included. Note: Light and assorted exhibits could cause the colour of the thing within the picture somewhat varied from the real thing. The measurement allowed error is +/- 1-3cm.