This Sea Reactive Ink Cubes Pack is from Hero Arts. These ink cubes measure 1.25" x 1.25". There are 4 beautiful blue and green shades in this pack, Blue Hawaii, Splash, Blue Raspberry, and Pool Party. This ink is a special formulation that reacts when spritzed with water to create a wide range of dramatic effects. This ink is quick-drying and water-based. This ink is great for layering and ink blending but works best with water techniques. This ink can also be heat embossed if you move quickly. You will love not only the bright colors in this pack but also the creative ways in which you can use these inks. This ink is made in the USA.