The Ballograf Epoca uses a slightly modified Parker style G2 refill. The lower, metal component is identical to that of the Parker G2 but the upper plastic part is shorter, hollow, and does not have the stepping found on the Parker style.
This means the Parker G2 and Ballograf refills are not interchangeable, but with a swapping of the plastic top piece they can be used in place of one another! Alternatively the Parker style refill can be cut down and shaped in order to fit Ballograf’s pens.
The Ballograf Epoca refill is sold in Fine and Medium, in both blue and black ink.
Ballograf Epoca Refill Information