* FITS MOST 16 Oz, 32 Oz, and 64 Oz GLASS MILK BOTTLES - Fits bottles with 48mm (1.89 inch) top with 33mm (1.3 inch) opening.
* REUSABLE AND BPA-FREE - Made with food grade BPA-free low density polyethylene plastic (LDPE, Recycle #4). Hand wash caps to extend life.
* TIGHT SEALING SNAP-ON CAPS- Glass milk bottle lids pop on and off with ease but maintain a no-leak seal, even when shaken with fluid upside-down