PPSU Milk Bottles are compatible with all Spectra breast shields, making it easy to pump, store and feed into the same container. PPSU is a medical grade plastic that is naturally honey toned and is intended for frequent use. This bottle size and teat are recommended for babies between 3 to 5 months, for younger babies please choose PPSU Baby Bottle 160 ml. For older babies get the Teat Soft Silicone Set Large or Extra Large size, or the Spectra Weight Straw Set. , , While plastic feeding bottles are more practical than glass bottles, there is the common idea that glass bottles are the"healthier" option, howevernot all plastics are equal. Have a closer look and you will find 4 kinds of plastic to choose from when it comes to baby bottles: PP, PES, PPSU & PA. If the bottle does not indicate the type of plastic, assume it is PP by default. The good news is there are bad plastics and not-so-bad plastics. , , PPSU (polyphenylsulfone) is the highest performing thermoplastic that gives better durability and heattolerance than PP and PES. Not only can it withstand continuous exposure to heat and have extreme capability to absorb impact, PPSU plastic does not absorb odor or color.It is naturally BPA free.Due to its high melting point of 208" degree "C, PPSU plastics are commonly used in medical devices that require repeat sterilization. PPSU milk bottles are significantly more expensive than PP and PES bottles, but if you are willing to spend on milk bottles that your baby uses 5-6 times a day every day, thismakes for aworthy investment. Despite itssupreme durability, it is advisable tochange your PPSU milk bottles yearly. , , The Spectra PPSU Milk Bottles are compatible with all Spectra breast pumps, making it easy to pump, store and feed into the same container. Authentic Spectra spare parts are engineered, tested and approved to work specifically with your Spectra breast pump. Non Spectra spare parts can vary significantly in design, materials, and workmanship; all of which may affect the performance of your Spectra breast pump. Spectra milk bottles and products that come in contact with breast milk are and always have been made without BPA, retaining breast milk's beneficial properties. , , This bottle size and teat are recommended for babies above 3 months, for younger babies please choose Spectra PPSU Milk Bottle 160ml. , , What's in the box? , 1 x PPSU baby bottle 260 ml , 1 x lid , 1 x soft silicone teat Size M (3 to 5 months)