The lip balm tubes are made of food-grade plastic that is odorless, BPA-free and non-toxic; the high quality material ensures that the hot mixture will not buckle when poured into the tube; the material will not deform or crack during the cooling process. Easy to use, simply fill the tube and leave it to cool and dry; use a spatula to scrape off excess lip balm from the top of the tray; our lip balm containers come with a standard push-up twist mechanism to push and retract the lip balm stick.