They are a hybrid between conventional skyphos and band cup.
The shape of the skyphos is combined with decorative scheme of band cups.
The fact that not a single band skyphos has so far been found to be signed indicates that the producers were aware of that difference.
There are a number of further related shapes: for example, the Hermogenic skyphos (named after the potter Hermogenes), produced in a similar fashion to Komast Group skyphoi, but with very fine thin walls and slightly flayed lips.
The Amasis Painter added a red stripe each on the exterior and interior surface to the conventional decoration.