Grosmimi Replacement Straw KitStraw teat is made up of platinum silicone which is very hygienic and safe, BPA free material. The smoothness of the straw protects babys teeth and gum It can be used in a 2 way system, baby can drink while sitting down with the tube, or drinking in a lying down position without the tube. Silicone straw nipple teat comes in 2 different stages, same cut but different intensity, Stage 1 suites from 6 month+, Stage 2 suites for 12 month+. +cut prevents