Packaging and contents: 1 piece refill only. Gel Refills blue. Product can be used with: For Cross Selectip pens Apogee, ATX, Beverly, Botanica, Calais, century II, edge, Peerless, Townsend Special Edition signs of the zodiac. Cartridge Type: 8521. Type of ink: water-based gel ink, indelible, fade-resistant. Type: Rollerball Pen, 0.7 mm, Blue. Packaging and contents: 1 piece refill onlyProduct Type: Gel Refills Blue Waterproof: No Waterproof: Yes Fade-resistant: Yes Item Name: Gel Refills Product can be used with: for Selectip pens Apogee - ATX, Beverly, Botanica, Calais, Century II, edge, Peerless, Townsend Special Edition signs of the zodiac Writing colour: Blue Tip Type: Rollerball Pen Stroke Width: 0.7 mm Name of ink: water-based gel ink Cartridge Type: 8521