Best anti leak suction facilitating mechanism weight straw made from food grade silicone. This product being completely PVC, BPA, phthalate and lead free is 100% safe for your babies. It allows smooth flow of milk in any position. This straw can reduce air swallowing or feeding problems like gas, burping, colic and spit-up as it allows milk or any liquid to flow only when sucked. Partial pressure automatic plastic weight ball is attached to one end of the straw. Strategically designed adaptor/valve with double air vent- prevents air to enter or trap in the bottle. The adaptor holds the straw in the bottle and connects it to the nipple (nipple not provided). Available with a 13.4 cm long cleaning stick that helps clean food build inside the tube and weight ball. The nylon bristles of the cleaning brush are attached to 2.2 cm rust free and stainless wire. Its handle is made of polypropylene plastic. This dynamic and advanced product is suggested for babies above 4 months. All the parts of this Anti Colic Suction Weight Straw are detachable ensuring proper cleaning.