Sheaffer 8521SH C style refill for gel rollerball pen is a pleasure to use because they write very smoothly without any smudges, blobs or scratchiness. It is a perfect choice for standard sheaffer pop and award pens. Suitable for general-purpose writing, highly reliable and convenient for use on all paper/ refill. Sheaffer 8521SH measure 0.7mm tip size. It features click-off cap and blue ink color.