1.gallon bottle cap with label(RK-Z8) 2.used in gallon water bottle ... PE materil ,food grade ,one time use 3.Equipped with stopper in top wear, absolute one-off hole without repetition use ... , can use with lid label, outer wall edge,outside power can easily tear ... one, four-in-one, recycle or one-way.use with one time heat sticker and inner liner or not. one ...