PVC material: PVC is polyvinyl chloride, which has good flexibility, water resistance and certain chemical resistance. This material can effectively prevent stamps from getting damp and dirty, and protect the quality of stamps. For example, in a humid environment, the PVC protective cover can block water vapor and prevent stamps from getting moldy and fading due to moisture. Black background: Black background can enhance the visual effect of stamps, making the patterns and colors of stamps more vivid and prominent. At the same time, black can reduce the reflection and refraction of light, avoid damage to stamps caused by light problems, and help maintain the color saturation and clarity of stamps for a long time. Anti-wear: Stamps are easily rubbed against other objects during daily storage and handling, causing wear on the stamp surface. The PVC black card stamp protective cover can isolate the stamp from the outside world, effectively reduce friction, prevent scratches and wear on the stamp surface, and ensure the integrity and beauty of the stamp. Size adaptability: There are various sizes of PVC black card stamp protective covers on the market to accommodate stamps of different sizes and shapes. You can find a protective cover of the right size to achieve a tight fit and provide all-round protection for the stamps. When using PVC black card stamp protective sleeves, you should pay attention to choosing products with reliable quality, no odor, and high transparency to avoid adverse effects on stamps due to material problems. At the same time, when putting stamps into the protective sleeve, be careful to prevent the stamps from being damaged.