Compatible with all sizes of Philips Avent Classic+ bottlesnDesigned to hold all Philips Avent Classic nipples and spoutsnCan be used with sealing discs to convert bottle into breast milk storage containernIncludes 4 Classic bottle screw ringsnIncludes 4 bottle screw ringsnInterchangeability and compatibilitynFor all sizes of AVENT feeding bottlesnBPA freenHelp your baby's Classic Philips AVENT bottles last longer with Classic Philips AVENT Bottle Screw Rings. Made from BPA free material, this set of four replacement screw rings fit all sizes of Classic bottles. These Bottle Screw Rings replace ones that become lost or damaged, so your Classic Philips AVENT bottles and components can last longer.