We now offer 2 different style cartridges. Both have a 2 part stabilizer system that keeps your needles from moving around, giving you very consistent lines. Model B is geared toward smaller lines with updated housing. Available in bugpin liners, standard liners and bugpin curved mags. Model A is the same classic style you’ve grown to love, that matches needle on bar exactly. Available in tight liners, standard liners, bold liners, standard mags and curved mags. Both models are membrane cartridges to ensure no cross contamination in your machine.