These sets feature professional grade acrylic inks that are extremely fluid so there is no need to dilute for use. They are fast drying, water resistant, non-clogging and permanent. Superfine pigments are suspended in a state-of-the-art acrylic emulsion to provide rich color. All inks are intermixable with the other Liquitex acrylics and mediums. Each set includes six 30ml bottles.