Thermoplastic polyurethane (TPU) is a class of polyurethane plastics with many properties such as elasticity, transparency, and resistance to oil, grease, and abrasion. For these reasons, TPU is the ideal plastic for making smartphone and tablet covers, among other things. It pulls tightly around your device and also provides a firm hold when holding. As a business customer at MobileSupplyStore.com, you have a very wide choice in all types, sizes, and colors of TPU and silicone cases. We have silicone covers with a print or completely transparent with or without color.