Tags are a necessary item, make them as attractive as possible. Don't use white string. I use gold quilter's thread on my coffee scoops. You can use Microsoft Word to make quite nice tags. On stoppers, tie the tag on the stainless steel just above the first o-ring rather than on your design.
The tag on the scoop has a full description including the type of wood. The other little tag says "Woodturning by Ruth Niles" on the right side, folded in half with price inside, a small hole for the thread. Download the card format.