The dustproof and waterproof functions of the game card holder are mainly achieved through the following methods:

1. Closed design: Game card sleeves usually adopt a closed design, that is, there are sealed edges around and at the bottom of the card sleeve. This prevents dust, dirt, and other impurities from entering the interior of the card sleeve, keeping the card clean and dust-free.
2. High-density materials: Dust-proof and waterproof card sleeves are usually made of high-density materials, such as polymer composites. These materials have a high density and tight structure that effectively blocks the penetration of dust, dirt and moisture.
3. Water sealing design: Some game card sleeves are equipped with a water sealing design, that is, a special sealing device is used at the opening of the card sleeve. This design can effectively prevent moisture from penetrating into the card sleeve and protect the card from liquid damage.
4. Water-resistant materials: Water-resistant game card sleeves are usually made of water-resistant materials, such as waterproof plastic or coating materials. These materials are waterproof and can
withstand rain, liquid splashes, etc., protecting the card from liquid damage.