This is a 59 mm diameter metal button. There are 4 versions to choose from.
There is the pin badge that you can attach to something like a jumper or a cuddly toy.
The magnet version can be stuck on your whiteboard or fridge: useful for pinning up notices & notes.
The mirror version is handy for those last minute checks on your make-up.
Finally there is the bottle opener for those thirsty moments: you never know when you might need that bottle of Cola or something stronger.