Drop-Ins Original Nurser provides an excellent value while reducing gas, colic and spitting up. The pre-formed and pre-sterilized liners allow you to squeeze the extra air out of the bottle. And the liner is discarded after each feeding for easy cleaning. Contains: 1 8-10 OZ Nurser - Dark Blue, 1 NaturaLatch Slow Flow Latex Nipple, and 5 Drop-Ins Liners