Food-grade silicone material ensures safety and our products are BPA-free, giving you peace of mind while using them.Save time and effort by using these replacement parts to find the correct size for your nipples, eliminating the need for testing different teat sizes.Our replacement parts provide good suction, prevent milk backflow, and maintain optimal performance for your breast pump.Suitable for wearable breast pumps, these caliber converters prevent excessive inhalation of the areola by ensuring the diameter of the breast pump horn is not too large.Compatible with any brand of breast pumps with an inner diameter of 24mm, making it a versatile option for all breastfeeding mothers. It is the ultimate solution for mothers looking to find the perfect fit for their breast pump. With these replacement parts, you can say goodbye to the hassle of testing teat sizes and selections. Designed with convenience and safety in mind, our converters are made from food-grade silicone material that is completely free from BPA. You can use them with confidence, knowing that they are safe for you and your baby. Plus, they can be easily cleaned by boiling at high temperatures, ensuring optimal hygiene.Not only do our converters provide good suction, but they also prevent milk backflow, keeping your breast pump at its peak performance level. They are specifically designed to prevent the diameter of the breast pump horn from being too large and excessively inhaling the areola. This makes them perfect for wearable breast pumps.What's more, our converters are compatible with any other brand of breast pumps with an inner diameter of 24mm. So no matter what brand you use, you can enjoy the benefits of our converters.Don't waste time and money on testing different teat sizes. Our breast pump caliber converters will help you find the correct size for your nipples effortlessly. Experience the convenience and comfort they offer today! Item Name: Caliber Converters Material: Silicone Features: Unique, Universal, Perfect Fitting Design Size Details: 13mm Caliber Converter: 1.3cm/0.51" (Approx.)15mm Caliber Converter: 1.5cm/0.59" (Approx.)17mm Caliber Converter: 1.7cm/0.67" (Approx.)19mm Caliber Converter : 1.9cm/0.75" (Approx.)21mm Caliber Converter: 2.1cm/0.83" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement. Package Includes: 5 x Caliber Converters2 x Silicone Diaphragm 2 x Valves