The Parker M 1950371 blue ballpoint pen refill offers the perfect balance between smoothness and definition thanks to its medium (M) tip. Equipped with the Quinkflow system for intense blue ink and a 1.0 mm tungsten carbide ball, this Parker refill glides effortlessly across the paper. The vibrant blue shade is suitable for all types of everyday documents. It is the most recommended standard refill to renew the life of any Parker ballpoint pen.