Package totally have 5 items which includes 4 coaster silicone molds and 1 large tray mold. Material: art resin molds are made up of silicone, very flexible and easy to clean and it re-usable, not easily damaged. When you do the project, it will check project process in anytime with transparent. Easy to release: with smooth and shiny interiors, and reduces the need to cut back and polish. After your project is fully cured, it will be easy to pull your finished resin items out after it's fully cured.After that you could use release spray, it might be help you extend your molds life. Ideal gift: an adorable gift for the resin craft lover, special christmas gift for your friends and family to enjoy the resin craft times. Bring more happiness to your daily life.