For this week's giveaway, we've teamed up with Krown to give MacRumors readers a chance to win one of four slim iPhone cases made from unique materials.

Krown is an indie iPhone case manufacturer that offers cases for Apple's newer devices, including the iPhone X, iPhone 8 and 8 Plus, iPhone 7 and 7 Plus, and the iPhone 6s and 6s Plus. The company makes cases in four materials (prices for iPhone X): aluminum ($24.95), concrete ($39.95), an ultra thin plastic ($19.95), and marble ($49.95). All Krown cases with the exception of the aluminum model are compatible with wireless charging.

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The Slim Aluminum Case is made from a brushed aluminum material that comes in blue, black, gold, or red. To protect the iPhone, there's a soft rubber material inside of the case, and it features a lightweight, minimal design with no unnecessary bulk.

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Krown's Concrete iPhone Case is thicker than the aluminum case, but as far as cases go, it's still relatively slim. It's made from a concrete and resin material that's smooth to the touch, and inside, there's a soft rubber for drop protection. There are two shades of concrete available: dark with a black border and light with a white border.

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The Ultra Thin iPhone Case is similar to other ultra thin cases on the market, measuring in at 0.012" thick. These kinds of cases often don't offer much in the way of drop protection, but they're the best way to preserve the slim design of the iPhone while also protecting it from scratches. Krown says its version, available in dark blue, black, red, and white, is designed to "feel invisible."

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Krown's Marble iPhone Case is similar in design to the Concrete case, but instead of a concrete back, the outside of the cases is made from a thin layer of genuine marble that comes in black or white. Inside, there's the same soft rubber used in other cases, which offers protection for drops and bumps.

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We have 15 Krown cases to give away to MacRumors readers, with winners able to choose case size and material. To enter to win, use the Rafflecopter widget below and enter an email address. Email addresses will be used solely for contact purposes to reach the winners and send the prizes. You can earn additional entries by subscribing to our weekly newsletter, subscribing to our YouTube channel, following us on Twitter, or visiting the MacRumors Facebook page.

Due to the complexities of international laws regarding giveaways, only U.S. residents who are 18 years or older and Canadian residents (excluding Quebec) who have reached the age of majority in their province or territory are eligible to enter. To offer feedback or get more information on the giveaway restrictions, please refer to our Site Feedback section, as that is where discussion of the rules will be redirected.

The contest will run from today (March 9) at 11:00 a.m. Pacific Time through 11:00 a.m. Pacific Time on March 16. The winners will be chosen randomly on March 16 and will be contacted by email. The winners will have 48 hours to respond and provide a shipping address before new winners are chosen.

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