Yokohama Silk Mask Filter is a set of 3 mask-shaped inner sheets for use with silk cotton outside and 100% silk disposable masks (pleated non-woven masks). Special features include flaps and silk loop straps on the left and right side, so if you put the loop strap on the mask on the ear strap, it will not fall off or slip when eating or removing your choice, it is very convenient. In addition, the parts that touch the skin are all silk through the sewing thread, so due to the effect of gentle ingredients that are gentle on silk people, the moisture absorption properties of silk and silk cotton, as well as the ability to improve the skin from damage to those with sensitive skin or synthetic allergies, this product can be used with confidence. Compatible with non-woven fabric masks as follows: Regular Height 3.5 x Width 6.7 - 6.9 inches (9 x 17 - 17.5 cm)