Cruzerlite Franco Kernel Case for Nexus 4 Keep your Nexus 4 safe and protected in style. Slip your Nexus 4 in to add color. TPU is more cut and tear resistant than rubber. It is abrasion resistant, and has a high degree of transparency. This skin is more stiff than silicone skins, but remains flexible. Applicaton and removal are easy. Shock absorbent, shatterproof, and anti-scratch material