Costar Tech Corporation
A special USA custom (Ballistic) help and teach us to produce the good quality pure clear TPU case for AT&T. My factory is providing more million TPU cases for them until now , AT&T is still open a lot of tools in these 4 years.
Current I designed the new TPU case have Air chamber at four corner according these four corners to lift smartphone from ground to protect the surface shock and scratches as below.
The four corners lift up smartphone from table (six sides) , each side is only four points or two points to touch the table.
Air chamber ( four corners) absorb the more dropping weight