WIDE-NECK COLLECTION BOTTLES COMPATIBLE WITH AVENT, SPECTRA S2, SPECTRA S1, SPECTRA 9PLUS PUMPS. 100% LEAK PROOF & 5-mL FINE MEASUREMENT MARKS . Incl. silicone SureSeal (TM) sealing disc so no leak at all; The bottle has 5-mL incremental measurement marks. You know exactly how much milk you have produced. BALL-PEN WRITEABLE TOP - the SureSeal silicone top can be marked with a ball-pen, and removed with soapy water. You can date the bottle to know the age of the contained milk, or name the bottle so no mix-up in the daycare refrigerator. BOTTLE FITS NIPPLES AND RINGS of AVENT NATURAL, AVENT CLASSIC, and SPECTRA BOTTLES.
