I purchased a set of two of these in an attempt to find a solution for my baby's refusal of bottles. Unfortunately, this product didn't work either, so I am selling one unused nipple. [Brand] Pigeon [Product Name] Breastfeeding Realization Direct-Attach Nipple for Hospitals and Clinics [Size] Weak Sucking Nipple WS-2 [Quantity] 1 piece Can be used with Breastfeeding Realization hospital and clinic bottles KR-50, KR-100, and KR-200. Weight目安 is 2,500~3,500g. *Please be aware that the nipple will be flattened for shipping.