"Pura Kiki 5oz/150ml Stainless Steel Infant Feeding Bottle Pink Swirl Sleeve 5 oz is perfect for the wee ones and ships with a stainless steel collar, slow-flow Pura Natural Vent Nipple, a silicone sleeve and a silicone nipple cover. As with all Kiki bottles, the 5oz Kiki can be used with nipples or sip spouts from a variety of manufacturers so you can be sure that junior won’t have any problems if you are switching from another bottle. Volume graduations that can be seen from the interior to help you monitor how much liquid your baby is consuming. The 5 oz bottle combined with our silicone sealing disks or Big Mouth sport top are also great for older kids as they can be used for snacks and variety of drinks… and they fit into almost any lunchbox! Only 100% plastic-free bottle on the market; only NonToxic Certified bottles on the planet. Baby Grows… Bottle Evolves: Crafted from safe, anti-bacterial, #304 stainless steel and medical grade silicone. BPA-free and will not leach toxins like plastic bottles and rings. Dishwasher safe and shatterproof. GENERAL INSTRUCTIONS: Wash before first use. Boil for 5 minutes to sterilize. Remove the sleeve from the bottle at least one time per week to clean between the bottle and sleeve, more often in humid climates. Dishwasher safe. How to install sleeve: Add baking soda to the inside of a dry sleeve then slide onto the bottle. Rinse thoroughly. OR At the sink, spread a pea-sized drop of liquid dish soap inside the sleeve then slide the sleeve onto the bottle. Rinse thoroughly."