The product OL375TG (true green labels for laser or inkjet printing) is a paper based material. You may initially get a little smearing when using a handstamp on the material, but once the ink dries it should be ok as long as you don't get it wet or subject it to the moisture. Obviously, the amount of ink you lay down from the handstamp will play a key role in whether it smears or not. We are happy to send you a sample of the item for testing if you would like to fill out our sample request form at https://www.onlinelabels.com/samples.