One Tough Shield &reg; Hybrid Layer Phone Case (Black/Green) for Nokia Lumia 521 - (Soccer) Compatible with: Nokia Lumia 521 3-Layer casing. FRONT and BACK Hard Cover combined with Soft Silicone Case. The 2 outer layers are crafted out of high quality hard plastic. The inner piece is made with a durable silicone material. Shock Absorbing. Phone NOT Included.