[ Photo Frame Design]- The photo frame is designed for easy storage, and the holes on both sides are easy to take out [High Quality]- The magnetic field display film is made of high quality nanomaterials. It is reusable, , and automatically recovers immediately after use. [Instant Auto-Recovery]- Our magnetic film sheet is reusable and automatically recovers after use, just put it on the of the magnetized object to observe the range and strength of the magnetic field [Good tool for learning]- Visualize the magnetic field lines of different objects and magnets. The magnetic field remains on the film, so you can further analyze the magnetic field pattern until use. A great educational tool for magnetic research and analysis!<br><br>size: 100 x 150mm Material: composite material colour: As shown<br><br>Package Contents: 1 x Magnetic Field Observation Film<br><br>Only the above package content, other products are not included. Note: Light 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.