Nipple measuring ruler: This tool helps mothers accurately determine the correct breast pump size. Multiple sizes: The ruler features various clearly marked sizes, making it easy for new mothers to use. Easy to carry: Made of flexible silicone, the ruler measures 18 cm x 10 cm (7.09 in x 3.94 in) and can be rolled for convenient storage and portability. Includes a bonus measuring ruler for on-the-go use. High-quality material: Constructed from soft, durable, odor-free silicone that resists deformation and can be rolled without damage. Fit: This nipple measuring tool is a helpful accessory for new mothers to ensure proper fit and comfort during breastfeeding or pumping. Specifications: Material: Silicone Size: 18 cm x 10 cm (7.09 in x 3.94 in) Package includes: 1 nipple ruler, 1 measuring ruler Note: 1. Not an infant toy. Keep away from children to prevent ingestion. 2. Slight variations may occur due to manual measurement and screen display differences.