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 efficiency during pumping. This nipple ruler helps you quickly determine the appropriate nipple fit to enhance your breastfeeding experience. 2. SOFT AND SAFE MATERIAL: Made from high-quality silicone, the nipple ruler is odorless, non-toxic, lightweight, and flexible. Unlike rigid plastic with sharp edges, this ruler is soft and bendable, designed to avoid skin irritation. 3. ACCURATE AND QUICK MEASUREMENTS: Featuring measurement scales along the edge and multiple sizing holes, the ruler allows for precise and easy measurements. It includes 21 nipple measurement holes ranging from 10mm to 30mm, clearly marked for readability. 4. SIZE ADJUSTMENT: Depending on nipple elasticity, you may need to adjust the size—smaller if nipples are highly elastic or larger if less elastic. If discomfort occurs or milk output decreases, consider trying a different size. 5. PERFECT GIFT: A thoughtful gift for new mothers to help them find the right flange size and support a comfortable breastfeeding experience. 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