LuvLap 4 in 1 Steel Feeding bottles cum Sippers are for ideal for baby's consumption of mother's milk, formula feed, Juice and other liquids. The body of the sipper is made of rust free SS304 steel. It is odour free also. The liquid is the sipper can be consumed through nipple, spout or Straw. as All these come with anti colic venting system. The Silicone cover on the body makes it easy to hold. Moreover when the he/she in sipping from it directly once they are trained to sip from a tumbler.