Welcome to our store! 1、GET THE RIGHT FLANGE SIZE: The correct breast shield size is crucial for comfortable and effective pumping. This nipple ruler helps you quickly determine the right flange size for a better pumping experience. 2、SOFT & SAFE MATERIAL: Made from excellent silicone, this nipple ruler is odorless, non-toxic, lightweight, and flexible. Unlike brittle plastic with sharp edges, it's gentle and won't irritate your skin. 3、ACCURATE & QUICK MEASUREMENTS: Using the scale on the edge or placing your nipple in a suitable hole, this ruler provides precise measurements with 21 nipple sizing holes ranging from 10mm to 30mm, and is easy to read. 4、SIZE ADJUSTMENT: Depending on your nipple's elasticity, you may need to go down a size if your nipples are elastic, or up a size if they are less so. If you feel discomfort or experience a continuous decrease in volume, try a different size. 5、PERFECT GIFT: A must-have gift for new mothers, helping them find the right flange size and enjoy breastfeeding. Item Type: Nipple Ruler Rectangular Size: Approx. 18 x 10 x 0.3cm / 7.1 x 3.9 x 0.1in Round Size: Approx. 11.6 x 11.6 x 0.3cm / 4.6 x 4.6 x 0.1in Material: Silicone Package Includes: 2 x Silicone Measuring Stick, 2 x Ruler Satisfaction Guaranteed: Customer satisfaction is our top priority. If you encounter any product issues, please contact the seller immediately. We are committed to providing satisfactory after-sales service.