Inside, you'll find a full-function, 8-digit, calculator with mini twist-action ballpoint pen held securely in a fitted flocked insert with black leatherette trim. Includes 1 button cell battery and refillable black medium point ink cartridge. It doesn't have hinge yet it seems to open like any other case. Continue opening it 360 degrees, however and the two halves roll toward each other which causes the pen and calculator to switch sides! Black medium point ink. Custom Colors; Silver-Black Imprint Information Imprint Limit: Standard on cover of case on silver center square (specify vertical or horizontal) 1 1/4" x 5/8" Color Matching: Yes