1.Magnetic Film for Visualizing Magnetic Fields 2.Magnetic viewing film is made of millions of tiny magnetic flakes 3.The magnetic viewing film can then be used to "see" the pattern of magnetization. When a magnet is placed under the viewing film, the tiny metal flakes respond to the magnetic field, forming shapes similar to the pattern of magnetization 4.Frame design protects the magnetic viewing paper 5.This is a good tool for science and education, to show students the application of magnets in their lives. and this magnetic field detector is excellent for discovering and observing new things This is great for seeing the poles on any magnet or motor. It's really interesting to see magnetism visually Colour:As Shown Material:composite material Size:Inner size 10x10cm,Outer frame size 14x14cm Package Contents: 1 * Magnetic Paper 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.