Flange Inserts: The flange inserts help to narrow the original-shield nipple tunnel and work well with breastfeeding to bring better performances and using for small nipple mother. Seamless Compatible for Breastfeeding : Best solution for small-nippled nursing moms by use the flange inserts to achieve reduce the shield nipple tunnel down to the accordingly size as you need, seamless and high compatible for most brand breast pumps. Selected The flange inserts use soft silicone, and excellent seal with performances, BPAfree and for delicate skin. Easy to : Our silicone flange inserts are easy to change & , dishwasher friendly, soft and food grade could take good care of your delicate breast skin and smoothly pumping as well. 8 Optional Sizes: Our flange insert with 8 optional size to , 13mm/15mm/17mm/19mm/21mm/24mm/25MM/26MM, suitable for mostly , electric or manual all applicable, before purchase please make sure you the correct size