CMS MAGNETICS 4" x 6" Green Magnetic Viewing Film, See Magnetic Field with this Magic Film to Learn Magnetism. Applicable for All Kinds of Magnets Including Neodymium Magnets, Lots of Fun! Green Micro-Encapsulated Film used to Show Magnetic Field, or Test Cracks on Steel Surfaces Very Interesting to Actually See the Magnetic Field! It is Flexible so can be Wrapped around the Tested Magnets Applicable to All kinds of Permanent Magnets, Such as Neodymium, Ceramic, SmCo, AlNiCo and Flexible Magnets. To Expose Magnetic Field, Place Directly on Top of the Magnets Wonderful Educational Tool for Magnetism Super Fast Delivery! Get Your Orders within 1 to 2 Days for Prime Orders and 1 to 4 Business Days for Non-Prime Orders