Lash On Medium Ultra Glue is for PROFESSIONAL USE ONLY. Medium Ultra is considered a sensitive adhesive & is ideal when learning the application of individual eyelash extensions. It is also recommended for use on clients with sensitive eyes. Fumes are minimal but the hold is strong. The dry time is not as quick as the Ultra Plus or Black Mini. We recommend that all Lash On Glue be kept in the refrigerator to extend its length of life. Medium Ultra is sold in a 10ml bottle.