Sandwich Low-Profile Cases consist of 2 halves machined from sheet-stock that is slightly thicker than half the thickness of the finished case. The cavity for the internal components is hogged out first before the CNC machine cuts the case perimeter. If needed, one or more frames can be fitted between the top and bottom layer to create a greater internal volume. Cases made in this fashion are extremely strong and are are often used to make rugged connector cases. Wands and sleeves for PCB antennas can also be made this way. Thick ABS sheet is the most common material