Eliot is Emalla's cartridge line. The round liner is for line work: outlines, contours and lettering. The needles sit in a round grouping, which keeps the line tight and closed. The long taper runs out gradually: a finer entry and less trauma to the skin.
0.35mm is the standard diameter: a bit more ink per pass, so you cover larger pieces faster.
This family runs in 4 needle counts (5, 7, 8, 9). You order per box of 20 individually sterile packed cartridges; pick the needle count you need below.