These 28mm breast shields and 26mm breast shield inserts from Philips AVENT are designed for larger breast and nipple sizes, providing a comfortable and secure fit. They are intended for use with the Philips AVENT Hands-Free Collection Cups. The confidence-building see-through collection cup allows for an unobstructed view to correctly position your nipple and monitor milk flow. This makes it easy to track breastmilk volume and simple to clean. Compatible with the Philips AVENT wearable breast pump, which mimics a baby's drinking rhythm for efficient pumping. The unique SkinSense silicone breast shields offer ultimate comfort by softly conforming to your breasts using your body's natural warmth, crafted from food-grade silicone. With a range of sizes available, these breast shields and inserts are designed to fit 99% of mothers, and can be purchased separately.