This extension straps is suitable for both adults and kids, comfortable, non-silp,no toxicThe mask band is as an extension strap and suitable for big face when using a small face mask with short ear-loop.The mask extension stap is with 3 adjustable card positions, clip the mask on the neck or the back of the head, and free the ears.Main features-stylish design, light weight, sterile, environmentally friendly PP flexible material, can be self-sterilized, easy to clean unlimited reuse non-allergic, fits perfectly to your head, maximum comfort wraparound Design, adjustable belt, tasteless, long life, etc.Size of those mask extender hooks: 17*2cmPacking include:200*Masks Extension (mask not include)