Description Function: Use it to observe changes in your body during pregnancy and postpartum recovery. A measuring tool can also help you take many measurements at home after your pregnancy is over. Product Material: Our nipple flange ruler is made of food-grade silicone, soft and flexible, with no sharp corners, safe and reliable for long-term use. Product Features: The nipple clamp size measuring tool can help you find the right size breast pump, avoid pumping pain, let new mothers enjoy breastfeeding and no longer be afraid of breastfeeding. Instructions: Please turn the back of the nipple towards yourself, then place the nipple in the maximum position that can be comfortably placed, then use a mobile phone or mirror to observe the size of the nipple. We recommend checking your nipple size regularly. Best Choice: New mothers get confused when choosing breast pumps or protective covers. Fortunately, our nipple ruler is soft, safe, comfortable, and harmless, providing comprehensive protection for new mothers and quickly determining the appropriate "breast pump". Package Content: 1 * Ruler Note: 1. Please allow a slight error due to manual measurement. Please make sure you don't mind before you bid. 2. The color may vary depending on the different display, please understand.