Knitting needle size reminder

The missus does a lot of knitting. Sometimes she leaves a project for a while and then is not sure what size needles she used when she goes back to it. She was wondering if I could make discs with mm knitting needle sizes on them. So I made the sizes she wanted and then I made a box to hold them in. Maybe it is of use to you. Attach a disc with a safety pin when you postpone a project. EDIT " They are also for pinning to swatches to remind you of tension" -that makes a lot more sense to me now 🙄 END EDIT
I printed three of some and six of more popular sizes. Before I printed them I turned them over (X by 180 degrees) to get a nicer finish on the face.