Adjustable Silicone Breathing Mouthpiece Respirator Breath Expiratory Exercise Device Household

Label:Yes material: silicone+abs product size: 5*10*3cm(1.97*3.94*1.18in) package include:1 x lung fitness trainer application: running, cycling, swimming color: black

note: due to the different monitor and light effect, the actual color of the item might be slightly different from the color shown on the pictures. thank you! please allow 1-3cm(0.39-1.18in) measuring deviation due to manual measurement.