These bottle rings are for use with Pacific Baby’s 3-in-One or All-in-One bottles. These rings can be used to hold either a TEAT OR SIPPY SPOUT FOR THE 3-in-One BOTTLE, or to hold a SIPPY SPOUT ONLY FOR THE All-in-One BOTTLE. The bottle ring is used to affix the silicone teat or sippy spout to the bottle, allowing baby to feed. Once the teat or sippy spout is in place with the brim at the top of the ring, the ring can be screwed onto the bottle snugly