Features: Breast Pump Flange Inserts: The breast pump flange inserts help to narrow the original-shield nipple tunnel and work well with breastfeeding pump to bring better performances and using experience for small nipple mother. Seamless Compatible for Breastfeeding Pump: 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 pump. Selected Material: The breast pump flange inserts use soft silicone, skin-friendly and excellent seal with perfect performances, BPAfree and safety material for delicate skin. Easy to Clean: Our silicone flange inserts are easy to change & clean, dishwasher friendly, soft and food grade material could take good care of your delicate breast skin and smoothly pumping as well. 6 Optional Sizes: Our breast pump flange insert with 6 optional size to select, 13mm/15mm/17mm/19mm/21mm/24mm, suitable for mostly breast pump, electric or manual all applicable, before purchase please make sure you select the correct size Specifications: Material: silicone Size: 13/15/17/19/21/24mm(optional) Package Includes: 1xBreast Pump Horn Converter note: Please allow 1 to 3cm error due to manual measurement, please make sure you do not mind before you bid, Due to the difference between different monitors, the picture may not reflect the actual color of the item.