Cute Butterfly suction coffee mug markers for any occasion or as a gift. Easy to use, durable and re-usable. Super easy to apply and remove, the suction cup of these soft silicone charms are durable and stick well to non-porous flat surfaces like glasses, mirrors windows and stainless steel. Can be used over and over and they leave no residue on your fine glasses. Please come back and vsit us often as we add more varieties. Thank you for your time.