Parker Quink Permanent Ink Refill Cartridge for Rollerball Pens, Medium Point, Black (3021531). Refills offer an extra-smooth writing experience and better ink flow for optimal reliability and performance. Exclusive ink provides optimal performance with no blockages or breaks. Chrome barrel with black accents is timelessly tasteful. Innovative Rollerball FreeInk Technology assures an incredibly smooth and intense writing experience. Parker Quink inks are specially designed and formulated to the most exacting standards to ensure that Parker products deliver faultless performance. Limited warranty guarantees product for 2 years from date of original purchase against defects in materials or workmanship.