Package Details: 2Pcs 19mm Flange Inserts and 1Pair Silicone Nipple Corrector,Nipple Ruler and a 60-inch Soft Ruler Specification: Material: Silicone Color: Clear Note: Using coconut oil or nipple butter can reduce friction and make them easier to use. If it will be loosened, deformed or yellowed after a long times of use, please replace it in times.