Medela Bottle Nipple Collars Rings New! For Slow or Medium Flow Wide Base (4 Collars)<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"> NOTE: This collar can not be used with Medela Standard Base Nipples </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/41nzJO52OGL.jpg" noproxy>