Hybrid TPU Back Cover for BlackBerry Bold 9900 9930, Black/Smoke Protects the side edges and back of your phone. Hybrid cover consists of a flexible, semi-hard, semi-soft Thermoplastic Polyurethan (TPU) edge and a frosted hard back. Stylish glossy TPU edge provides shock-absorbing protection. Lightweight TPU is resistant to taring, stretching and deforming. Impact-resistant hard back makes this skin cover slide easily into your pocket or purse.