These stoppers are made for the white trays with spout and "MOSFA" on bottom (10.6cm x 5.9cm). They can be labeled with sharpie and taken off with rubbing alcohol (it does leave residue on surface) or use labels on them. They may be a little loose because every Diamond Painting tray is so slightly different and so we wanted to try and account for that.
Everything is made to order and may take 1 1/2 - 2 1/2 business weeks to ship based on demand, but we always strive to shorten that if possible. Quality is our #1 priority.
With 3D printing, there might be some slight imperfections, but it does not interfere with functionality. If you have any issues, reach out to us.