Magnetic passbook case made of high quality suede touch PVC leather. Protects your passbook and cash card magnetic data from bag magnets, electromagnetic waves on mobile phones, electronic products such as TV and microwave ovens. The strength of magnets for magnetic boards (about 950 gauss) can be weakened to approximately 70 gauss. It is said that the magnetic data can be protected under 150 gauss, and it is estimated that it can protect most of the external magnetic fields in the living area. The data is measured and does not guarantee the results. Examples include 500-1200 Gauss Cell Phone (Speaker) 40-600 Gauss, and all drawn bills, statements, and cash cards can be stored in one book.