✅【Breastfeeding Essentials Helper Highly Compatible with 24mm】These breast pump flange insert kits are designed for most 24mm wearable pumps. We have developed 15mm/17mm/19mm/21mm flange inserts based on feedback from thousands of new mothers, they are meet for most mothers during different stages of breastfeeding. Spending less money get suitable size and reduce unnecessary expenses for family. | ✅【Safe & Easy to Clean】These inserts are made of food-grade liquid silicone, the soft silicone material is designed to stimulate milk flow and increase comfort during use, reduce pumping time and maximize milk production. They can be sanitized using around 100°C (212°F) water steam or boiling water, easy to clean and dishwasher safe. | ✅【 Getting Right Size 】Using our silicone nipple measurement card can help you accurately measure changes in size during different stages of breastfeeding, and replace the most suitable flange in time to ensure maximum comfort and pumping efficiency. In the middle or late stages of breastfeeding, if there is little change of your nipple sizing, we recommend purchasing the corresponding size kits directly and eplacing them every 2-3 months to maintain optimal functionality. | ✅【Upgrade 12mm Tunnel 】The newly upgraded 12mm short flange tunnel facilitates faster penetration of breast milk into the container and preventing backflow. Some mothers have the experience of nipple swelling while milking, It may be due to frequent use of excessively long flange tunnel. So we have improved the design to reduce friction and discomfort of the nipple in the flange tunnel. | ✅【Caring Service】We have prepared sufficient accessories for your breast pump. Moms can spend their feeding life worry-free. Supporting every mom with the beauty of parenthood, meeting theier needs. Please reach out to us if you have any doubt or suggestion about our products, we offer 24H/7D customer service support to answer any questions.