Smartphone Nokia Lumia 820 has a casing that is the hallmark of an authentic rear (or Nokia call it shell) that can be changed, plus shell features the wireless charging. In a post on Nokia's official blog, the company gave few details about the different types of shell are planned for the Lumia 820. Included are also the type of material used.
Shell is made of PC / ABS (Polycarbonate / Acrylonitrile Butadiene Styrene), a combination of two materials developed to facilitate shell to set up and good durability. Usually this kind of material used for the exterior and interior of the car. Color also matters is not just in the paint, but is of the raw materials that are color-coded so that if you scratch the shell is not going to leave a mark and also the color will not fade.
Nokia adds that there are also other types of shell are more resilient to Lumia 820 for better security. A softer shell is also made of PC / ABS, but added a type of rubber material around the front face and the corners. Shell will be available in a choice of yellow, green, and orange with black corners.