These cases are specifically designed with a built-in magnetic ring to be compatible with MagSafe accessories, such as chargers and wallets. Most variants are made from a mix of clear polycarbonate and flexible materials, with features like anti-yellowing technology and shockproof corners.
Amazon.com
Amazon.com
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While the packaging in your image appears to be a generic version, you can find similar official and third-party options across various retailers:
Official Apple Version: Available directly from Apple or premium resellers.