Welcome to ours shop! 17/19/21mm inserts are compatible with Medela/Spectra/Elvie/Willow/TSRETE/Bellababy/Momcozy/NCVI 24mm breast shields. It reduces the armored nipple tunnel from 24mm to 17/19/21mm. Also works with most other brands of 24-25mm models (Freemie). It is BPA free, ensuring the highest level of safety for your baby. This accessory helps the breast shield express more effectively and maximize milk expression while helping to avoid damaging or irritating the nipples. This design is a great choice solution for mothers with small nipples using large breast shields where appropriate The fit of the nipple tunnel is essential for comfortable and efficient milk output. Easy to clean, wash in warm water or machine wash -dishes. Easy to clean, don't worry about hiding in the pump Package: 3 breast shields 100% Satisfaction - Our customers are our top priority. If you find any product problems after receiving the goods, such as damage and incorrect quantity of goods, please contact the seller immediately. We try our best to provide you with satisfactory after-sales service. 🎉 Super Savings! 🎉 Enjoy unbeatable prices on top-quality items. 🛍️ Save big without compromising on quality! 🌟 🚚 Free & Fast Delivery! 🚚 Get your orders delivered quickly and for free on qualified purchases. 📦 No hidden fees, just convenience! 🏡 💯 Quality Guaranteed! 💯 Shop with peace of mind. 🛒 All products undergo rigorous quality checks to ensure satisfaction. 🛡️ 🎁 Diverse Selection! 🎁 Find everything you need in one place. 🛍️ From electronics to groceries, toys to home essentials, we have it all! 🌈 💖 Excellent Support! 💖 Our dedicated customer service team is always at your service. 💬 Ready to help with any questions or assistance 24/7. 💪