The J2-A3400 is a water proof synthetic polymer that has the general appearance of skin. Its purpose is to protect the interior of the EM-J2 Series from water and dust. The A3400 similarity to skin fails when it is touched. It is available in a variety of colors to simulate normal human skin tones.
The J2-A3400 is not shiny smooth, and does require basic maintenance in the form of simple washing with gentle soap and water. Punctures and tears in the J2-A3400 can be repaired by a tech with a tube of matching polymer and a curing heat tool.