The Eyebrows and other decorations that Modular Diva Designs sells are made form TPU rubber that is very durable and 100% reusable.
These are recommended to be attached using Spirit Gum theatrical adhesive but other skin safe adhesives like eyelash glue can be used as well. Below is a video on how to use and safely remove Spirit Gum.
You can find Spirit Gum at most costume shops or on Amazon using the following link: