As usual we test our products like a pro and we've found that one in every 15 trays tested, may have a strip or 2 of lashes where the extensions are a little bit more firmly stuck to the strip than we would like. They are usable but not quite to our high standard. Elite Eyelash Extensions mixed length trays contain 16 lash strips with the most common length ranges needed by most Lash Stylists for the curl. Each strip is labelled with their length, thickness and curl so you always know what you are using. The length is listed along the bottom edge of each strip for lash techs who like to trim off sections of their strips for exclusive use for each client.