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Material: silicone+plastic,durable to use;Size:external diameter:37mm /1.46" (Approx.); internal diameter: 25mm/0.98" (Approx.);Application:Suitable for sports masks,running masks,active carbon masks,etc..The role of mask breathing valve:In a humid or poorly ventilated or labor-intensive work environment, using a mask with a breathing valve can help you feel more comfortable when exhaling. PLEASE NOTE:1.Mask accessories,which should be used with mouth masks (not included);2.Due to the light and screen setting difference, the item's color may be slightly different from the pictures.3.Please allow slight dimension difference due to different manual measurement.
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