M size nipple with medium round-cut opening. Perfect for a baby who takes a long time to feed. For K-shape bottle nurser. Made of Rubber.
Nipple opening line-ups
Small round cut: from newborn to 2-3 month old.
Y-cut: From the time baby starts to do "play-drink"
Medium round cut: For babies who takes a long time to be fed.
Large round cut: For babies with a big appetite.
X-cut: For thick liquid.