Apple Iphone Custom Case 4 4s White Plastic Snap on - Chemistry Science Nerd Geek Symbols & Equations w/ Little Robots FITS IPHONE 4 AND 4S SNAP ON BACK PLATE Measures 4.5" x 2.25", Hard plastic, durable and lightweight. Protects edges and back of phone from bumps and scratches Compatible with Iphone 4 universal Sprint - AT&T - Verizon