1. Size type: 7.9 inches * 5.9 inches (one size). <br> 2. Each mask has an internal sliding opening (equipped with two activated carbon filters), which can be easily inserted into our mask, thus increasing the ease of use of the mask. <br> 3. Washable masks with bright and colorful designs-our high-quality masks are designed to make people around you smile when you wear bright colors and unique designs. With multiple colors and multiple designs, you can find designs that can inspire you. <br> 4. We have designed a mask with adjustable elastic ear straps to fit all facial shapes, so whether you are a boy, girl, elderly, or child, you can use our mask. The M-shaped nose bridge has an adjustable invisible nose mask that can be safely and comfortably fixed on your face. <br> 5. Great gift: This may be the best choice for birthdays or holidays to family, friends and lovers.