So good stickiness onto book covers, used a sharpie to write my daughters name, I love that these are part of a theme back, so we got the book bag, these labels and a swim bag all in the same design and it's actually pretty cool, wish we had the lunchbox and backpack and pencil cases, my daughter loves cats and so these are really cool design, in terms of longevity, can't comment only just put them on, but the sharpie didn't smudge after I finished writing the name. Really like this brand Spencil, affordable prices with cool designs.
