1. Usage: Nipple ruler can be used to measure nipple flange, help you quickly determine the right and suitable breast pump flange or other breast products.2. Prevent Pain: Silicone nipple rulers help you find right breast pump flange or shield to avoid pain during suction, allow you enjoy the process of breastfeeding.3. Easy Use: Hold nipple measuring ruler towards the edge on one side of the nipple and observe the size by looking in the mirror or taking a picture. Place the nipple in the largest circle you can comfortably fit into.4. 5m Soft Tape: With a 5m flexible ruler to observe your body changes during pregnancy and support the new mother body management during postpartum recovery.5. Soft Silicone: Breast flange ruler made of silicone material, soft and skin friendly, foldable and comfortable, which can provides all round protection for new mothers.