I’ve been using these labels for a couple years now. I love them. They are durable, easy to write on, and in the 50-pack are downright cheap. (I dont understand why some people sell the 20 pack of short labels for $10, and others sell the 50 pack of longer labels for $6. Wierd.) Hypertufa
I am giving them 4 stars instead of 5 because there is a 1cm round indentation on one side that makes that side hard to write on. I assume it is some relic of the plastic injection process, but it is right in the way of where I want to write, making these labels effectively one-sided. Oh well, they got everything else right.

One note in reply to a prior review – it does seem intuitively obvious to use a sharpie to write on these (or other plant labels.) However, sharpie (and other ink) does not last in the sun. Plain old ordinary pencil (graphite) is basically indelible and never fades in the sun. It really only comes off with an eraser (plus, with an eraser, pencil makes the labels re-usable – go green!) I recommend using #1 pencils (“ex-soft”) for easy writing on these labels [most ordinary pencils are #2, which works but not as well.]

More information at Luster Leaf Rapiclip 6-Inch Garden Plant Labels – 50 Pack 840