(6 Collars) MEDELA Bottle Nipple Collars Rings New! for slow or medium flow Wide Base<div style="text-align: left;"><strong>[Product Information]</strong><ul><li class="showHiddenFeatureBullets"><span class="a-list-item"> Spare Medela feeding bottle spare part - collar ring </span></li><li class="showHiddenFeatureBullets"><span class="a-list-item"> Can be used only with Medela Wide Base (id: 1 3/16 inches/ 30 mm) Nipples </span></li><li class="showHiddenFeatureBullets"><span class="a-list-item"> Safe plastic designed to retain breastmilk's benefits </span></li><li class="showHiddenFeatureBullets"><span class="a-list-item"> For cleaning bottle parts in the dishwasher - and keeping them together </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/416Gyl7EKDL.jpg" noproxy>