Due to glass fragile,so if you received broken products,please contact us direclty and show us the photo.Then we will solve your problem ASAP,Thank you! Material : High quality crystal glass;Size : 5.9’’ L x 3.9’’W x 0.2’’H (15cm x 10cm x 0.7cm), Groove diameter : 1'' / 2.5cm Eyelash extensions kit : distinguish the eyelash length and is a great glue holder. In order to clean this Crystal Glass more easy, we suggest you can put sticker pad to the groove area. Great for beauty salon and individual eyelash extensions.