These were made to be used on 8.5 x 11 Sticker Labels, there is no specific, individual label size.
I found these on Amazon https://www.amazon.com/SJPACK-Address-Full-Sheet-Shipping-Compatible/dp/B081CVHT9J/ref=sr_1_5?dchild=1&keywords=8.5+x+11+Sticker+Labels&qid=1603099230&sr=8-5
They are to be printed onto the full page and then cut out individually to then be stuck onto your dividers
Individual DMC Numbers – Pages 2-10
Colors – Page 10
Grouped DMC Numbers - Page 10
Blanks – Page 11
These are the stickers I’ve used on my own spare diamond storage. Elegant and timeless, they make me smile every time I’m putting my spare diamonds away. You can find much more information and videos on how the full system was created here: https://4kidsat147.com/diamondpainting/sparestorage