Features: Breast Pump Flange Measuring Tool for Nipple: The breast pump nipple measuring tool help to measure the nipple diameter and get the proper size pump flange that can work perfectly with your breastfeeding pump, solve new mom problems. Wide Range Diameter: The nipple ruler measuring card with 13 size circle that can meet various diameter sizing requirements, for long-time use no worry of nipple size changes. Selected Material: The breast pump flange measuring tool use food grade silicone, skin-friendly and accuracy scales, safe to use for delicate skin. Increase Your Breastmilk Production: The nipple ruler assist you to get the right size nipple diameter and find the proper breast pump flange, promote better breast milk flow and output under the correct flange size Simple to Use: The nipple measuring ruler which easy to use, simple hold the ruler with edge of your one side nipple, use mirror record the correspond scale, please make sure comfortably fit your nipple without forcing-it then to get the proper measuring size Specifications: Product Dimension: As-pictures shown Material: Silicone Style Option: Pink/Green/Light-Purple/Light-Brown/Matcha-Green/Light-Blue Package Includes: 1 x Silicone Nipple Measuring Card for Electric Breast Pump Flange note: Please allow 1-2cm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item.