This is the 2 oz. size Ideal Rubber Stamp Pad Ink. It is a water based ink. Ideal Rubber Stamp Ink can be used on Ideal Self Inking Stamps, Maxum Plus Rubber Stamps, Max Stamps, Trodat Self Inking Rubber Stamps, 2000 Plus Daters and Stamps, Cosco Eagle Zephyr Comet and other dater products, Colop Green Line Self-Inking Stamps and for all Stamp Pads that use regular office type stamp ink. Note: This ink is not for use on Ultimark, Maxlight or Xstamper stamps or any other of the fast dry stamp products. Choice of Black, Red, Blue or Green or Purple ink.