The fun silver colored key ring bottle openers make wonderful little gifts. They would also be great party favors or the perfect little stocking stuffer. The keyring bottle opener measures 9.5cm x 3cm. The actual design area is 2.5cm in diameter. The design is sealed beneath scratch resistant epoxy glass. The back of the bottle opener is smooth and can be seen in the last photo. These bottle openers are designed to open glass beer & soda bottles. They are not intended to open wine bottles.