Hi Linda, That's an interesting way to produce miniaturized numbers for labeling purposes. But wouldn't it be easier to just print them out from your computer? I guess I don't understand the advantage of using the plastic? If I use a number 8 font in my word processor, and then print it out at 25% actual size, I get legible text about 0.5 mm in height. Numbers printed in this way could be snipped out and glued on with any number of adhesives. Elmer's glue is somewhat acidic, and I would expect that it might cause noticeable etching of a glossy shell surface. How about clear nail polish for sticking them on? Paul M.