2 oz. bottles of Glaze. These are yours to keep. They will arrive in sanitized studio supply bottles. Color doesn't have an expiration date. The ideal consistency is that of melted ice cream. If your glaze is too thick you can add distilled water a few drops at a time and mix until it's the consistency you like. If you feel your glaze is too thin we suggest you leave the lid off for a few days to allow some of the excess water to evaporate. You should not heat, refrigerate, or freeze glaze and it will change the way it reacts when fired. These are yours to keep. You will not return them when you return your items for firing.