Features:1. New Mothers Helper: New mothers can be confused when choosing the perfect breast pump flange or shield to avoid pain during suction, fortunately, our nipples ruler can solve these problems for new mothers.2. How to Measure: Please hold our nipples measuring tool ruler 0 towards the edge on one side of the nipples and observe the size of the nipples by looking in the mirror or taking a picture, or place the nipples in the largest circle you can comfortably fit, it is recommended to measure and adjust the flange size regularly, and use the nipples measuring tool for the flange to measure each nipples separately.3. Reliable, Safe, Soft & Comfortable: Our nipples ruler, is made of silicone material, which can be bent, and is skin-friendly, safe and reliable, and suitable for long-term use.Specification:Material: SIlicone Product Color: Pink, Green, Brown, Blue, Purple, Light Green Product Size: 18 x 10cm Product Weight: 45g Package Included:1 x Nipples Ruler