BLUE water based Re-fill Ink for Cosco 2000 Plus Self-Inking Stamp refill 25cc` It can be used with for self-inking stamps from the following manufacturers:Cosco 2000 s,Ideal,Trodat,Xstamper ClassiX Water based Refill Inks for Self Inking Stamps. Available ink colors are RED / BLUE / BLACK / GREEN / PURPLE 25cc