About this article. High Quality Material: Made of premium polyester with pleasant touches, the mask fasteners are elastic and non-slip. With a sliding buckle, you can easily adjust the size of the extension as needed. Convenient use: Extenders are very easy to use. First, open the hooks at the ends and put the mask elastics there. Then close the hooks. Finally, adjust the size of the tie to your needs via the sliding buckle. No more earache: As everyone knows, the mask is now part of our daily life. The fasteners prevent damage done by the mask elastics. You can attach the elastics below the head or behind the head. Large Public: These clips are compatible with different types of masks. They are suitable for a variety of face shapes, limitless in different communities. Mask Attachment Pack: This set includes 5 mask extension straps. This is useful when you want to change another one or wear a few spare straps for different occasions. Having a set of mask fasteners, you can outfit the whole family or share them with your friends and colleagues.