brand new and high quality Features: Food grade material, non-toxic and harmless, no peculiar smell, safe to use Environmental friendly, washable and reusable Use silica gel which are safe material, no injury to the chest 17，19 ，21mm inserts to use with 24 mm detachable shields 24mm inserts to use with 27 mm detachable shields Insert to use with Breast Pump 24 or 27 mm detachable shields. It will reduce the nipple tunnel down to 17/19/21 or 24 mm. Almost for all major Brands with flange size of 24-27mm To reduce the existing funnel to smaller size Is the best choice for new mothers Specification: Material: Silicone Size : app.17/19/21/24mm Color: Transparent Optional Style: 1.17mm 19mm 21mm，2. 24mm Quantity: 1 Pc or 3pc Note: No retail package. Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package Contents: 1pc x 24mm Flange Inserts or 1pc 17mm Flange Inserts，1pc 19mm Flange Inserts，1pc 21mm Flange Inserts Food grade material, non-toxic and harmless, no peculiar smell, safe to use Environmental friendly, washable and reusable Use silica gel which are safe material, no injury to the chest 17，19 ，21mm inserts to use with 24 mm detachable shields 24mm inserts to use with 27 mm detachable shields