Glue Rings ensures your LBV Professional Adhesive drys slower because the airflow is obstructed.
The depth of the ring will minimise spillage and the grooves that you can see framing the rim of the ring is used for you to sweep your lash through to make sure your using the right amount of glue on each lash.
Using a glue ring is great when your training and you find lash isolation a challenge. Hold your isolated lash still, select your lashes and sweep it through the glue ring without having to move to the side of your clients head to use your Jade Stone. Your keeping your lash application in a smaller area.