It comes with a one-way valve (check valve), which is effective in preventing infection.
There is little resistance to air flow and no misalignment, ensuring a stable amount of air flow. Mouthpiece size (mm): 27 x 15 x 23
Storage size (mm): 60 x 65 x 20
Material: Mouthpiece: PP (polypropylene), one-way valve: silicone rubber, sheet: PE (polyethylene)
Sheet size: 210 x 200 mm
Comes with case
*Price per sheet.
