Features: ・ α -33 Boro-Silicate Glass: With low thermal expansion, high heat resistance, high shock resistance, high hardness, high transparency and low chemical reactivity. Presents a very high quality bottle material. ・ High Temperature Change Durability: Can resist 600°C, and up to 150°C temperature change. ・ Low Chemical Activity: Stable and neutral material, will not react with acid or alkaline, safe for making milk. ・ It equips with Silky Nipple: natural feel, ultra soft and preventing colic. ・ Wide-neck feeding bottle: makes it easy for you to load powder milk and convenient for washing clean. ・ Ingenious cap design: the milk is not easily flow out when making and shaking the milk inside.