Coveroo Stanford University - S with Tree design on a Black-Black iPhone 4/4S Guardian Case Go Cardinals! Show your support for Stanford with this official Stanford University Coveroo! This protective snap-on case for the AT&T, Verizon and Sprint iPhone 4/4S is an authentic iPhone accessory made by Coveroo, customized with a design of your choice. The design is printed using our HighColor process. Not a sticker or skin. Handmade by our team in San Francisco, CA