Sigma Nu - Letters Phone Covers and CasesIf you're looking to customize your device Coveroo has the most unique sigma nu - letters designs available. With over several to choose from you can find the perfect Coveroo for you, starting at only $76.95. We offer the widest selection of personalization designs and colors, all high-quality and wear-resistant. Whether itís a company retreat or reward, we'll make sure your Coveroo will leave a lasting impression, and we offer premium bulk rates. We have several payment options available, and FREE standard shipping an all orders within the US.