Regular inspection can help keep metal card sleeve TCG accessories in suitable condition. Check for sharp edges, loose parts, corrosion, scratches, or damage that could affect the card inside. Clean the exterior according to the manufacturer's instructions and avoid harsh cleaning products that may damage coatings or finishes. Before inserting a valuable card, ensure that the holder is clean and free from debris. If the product has an interior lining, check that it remains intact and does not create friction against the card surface.