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We made a stainless steel version of the iconic 12 oz glass mason jar. It's compatible with all Mason Bottle products so that you can turn your glass baby bottles and straw cups into stainless steel versions for on-the-go and older babies. This jar works for big kids and adults too. BENEFITS Ultra-lightweight stainless steel, weighs 3 oz/88g Use with our Silicone Nipples, Straw Tops, or any Mason Bottle product Compatible with any attachments for regular-mouth mason jars Volume markings to 12 oz for daycare/bottle feeding compatibility Max capacity of 16 oz Not for using in canning or long-term food storage! Freezer Safe Dishwasher Safe