1> Air Valve System - Maintenance of pressure balance by supplying air to the bottle 2> Leakage prevention - The cross-shaped mouth of the straw nipple. Even if you turn the cup upside down and shake it, it does NOT leak easily 3> Easy to clean Structure. 4> High-quality Silicone - The soft straw protects your baby's teeth and gums.

Medical grade silicone has no BPA, phthalates, or other toxics. The straw is made of Silicone which is the same material of baby nipples. Babies can easily use straw without any rejection. 2 counts of Straw nipple(6m+) for UBMOM straw cups and baby bottles.

Material Type Free: Bisphenol A Free. Material: Silicone. Size: Small. Brand: UBMOM. Best Sellers Rank: #25,346 in Baby. Customer Reviews: 5.0 5.0 out of 5 stars 1 rating 5.0 out of 5 stars. : B0B34CH9MW. Country/Region of origin: ?Korea, Republic of. Item Weight: ?1.76 ounces. Batteries required: ?No. Number Of Items: ?2. Material free: ?Bisphenol A Free. material_composition: ?100% Silicone. Material Type: ?Silicone. Product Dimensions: ?3.74 x 5.91 x 2.36 inches.