50 Pieces Breathing Valve Face Cover Mouth Filter Air Breathing Filter Accessories Can Replace for Most Kind of Double Air Breathing Valve, Round (25 White and 25 Black)

50 Pieces breathing valve face cover mouth filter air breathing filter accessories can replace for most kind of double air breathing valve, round (25 white and 25 black) Feature: Necessary accessories: Our breathing valve are made of polypropylene, easy to install in various face covers, necessary accessories for those who often wear face covers. Abundant quantity: Come with 50 pieces of face cover mouth filters in total, including 25 pieces of round white breathing valves and 25 pieces of round black breathing valves, enough quantity to use and 2 colors to choose. Specification: Material: polypropylene Outer diameter: approx. 37 mm/ 1.46 inch Inner diameter: approx. 27 mm/ 1.06 inch Color: as shown in the picture Package includes: 50 x Breathing valves Note: Manual measurement, please allow slight errors on size. The colors may exist slight difference due to different screens.