The magnetic refraction of a single sided magnet is similar to the refraction of signals by a satellite pot or the refraction of light by a flashlight pot. Its refractive effect is mainly determined by the following three aspects: 1. Material selection and thickness, as well as the distance between the magnet and the material. Pure iron sheet is prone to magnetic leakage, and after special treatment, its refraction will be enhanced. However, a 100% shielding material has not yet been developed, but the effectiveness of materials made by different manufacturers also varies. 2. Angle: According to the principle of refraction, curved materials have the best effect, while right angle materials have a greater refractive loss. 3. Space: Magnetic lines of force in the air are like mobile phone signals, requiring space to refract them. If the flashlight lamp pot is completely wrapped around the lamp, the use effect will definitely not be good, because a large amount of light refraction is lost. How to utilize the above principles to achieve the best magnetic enhancement effect is a problem of seeking the best among many parameters. This will greatly reduce production costs and save magnetic materials in fields such as packaging boxes and bags.