These alcohol ink tumblers are made with premium alcohol inks. At the moment, we use Brea Reese Colors ( different kinds in the future will be used). There are various methods of applying alcohol inks to tumblers; these are just some of the more common ones. You can add to epoxy and coat it, or apply epoxy and drip it on; you can paint it directly onto the cup using a brush or sponge; there are other methods available that add different designs. Some are ready to ship completed cups and can be custom made with any color you like.