rabbitgoo window film tool kit is made of high quality plastic and is anti-scratch and durable.They are suitable for static cling or non-adhesive films to scrape off air bubbles downright under the film. The squeegee is designed with a hole so that you can hang it on the wall when not used. This kit is really a convenient tool set for daily use. The Squeegee: smooth away the bubbles. Spray Bottle: fill it with water or soapy water to help wet the glass. Utility Knife: trim the excess edges. Keep out of the reach of children in case that the knife will hurt them.