You´ll never run out of ink again with ergosof and PenAgain original refills. If you´re a student, teacher, medical personnel or journalist and you´re tired of writer´s cramp, ergosof pens will help you un-cramp your writing style and change your life for the better, but don´t be caught out without ink. Always keep a couple of ergosof and PenAgain original refills handy. Black Ink, medium/dev4.0mm. Sold as 12 packs for a total of 24 refills.