This Japlo Biberon Bottle nipples comes with slip cut opening. The slip cut in the mouthpiece only open when a baby sucks. Adjusting the flow is as simple as rotating the biberon. This nipple is designed to direct the feed and fit naturally into the oral cavity. You can gently squeeze and release the nipple if baby needs additional help. All the parts of this pack are heat resistant upto 120 degree celcius. This nipple can be only used with Japlo Biberon Feeding Bottle
