You do not need to apply glue to the back surface that touches the eyelid. You just need to apply glue to the eyelashes. Curler silicone used on both upper and lower eyelashes to make a big difference in the eyelash lifting process. Pink color is in stock. It fits perfectly on the eyelid without any adhesive applied to the back. With the s m l xl thickness option, the product is sent in 4 pairs for the upper eyelid and 3 pairs for the lower eyelashes in s - M - L sizes. The distinguishing feature of the product is that it is produced with soft silicone and due to its curved ergonomic structure, it fits on the eyelid without using adhesive. Because of this feature, you use your glue only on your eyelashes. We recommend using adhesive on the bottom silicone.