Feature: 1. GET THE RIGHT FLARE SIZE: The flare size of the breast pump is important for breastfeeding. An improper flange size may affect comfort and milk expression efficiency. This nipple measuring tool helps you quickly determine the appropriate nipple shield size for a more comfortable experience. 2. SOFT AND SAFE MATERIAL: Made from high-quality silicone, this measuring tool is odorless, non-toxic, lightweight, and flexible. Unlike rigid plastic with sharp edges, this silicone ruler is soft, bendable, and gentle on the skin. 3. ACCURATE AND QUICK MEASUREMENTS: Featuring measurement scales along the edge and multiple sizing holes, it allows for precise readings. Includes 21 nipple sizing holes ranging from 10mm to 30mm, clearly marked for easy reading. 4. SIZE ADJUSTMENT: Depending on your nipple elasticity, you may need to choose a smaller size if your nipples are highly elastic or a larger size if they are less elastic. If discomfort occurs or milk output decreases, consider trying a different size. 5. PERFECT GIFT: A thoughtful and practical gift for new mothers to help them find the right fit and support a comfortable breastfeeding journey. Specification: Item Type: Flange Measurement Tool Rectangle 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 List: 2 x Silicone Measuring Stick