Pentel Refill Ink for Rolly 4-Color Retractable Ballpoint Pen, 0.7mm, Fine Line, Assorted Ink, 4 Pack (BKSS7BP4M) Ink refill for Rolly 4-Color ballpoint pen 0.7mm tip produces crisp, fine lines Pack includes 4 refills in the following color mix: Black, Red, Blue and Green