Lumps on paper are coated with an adhesive used to hold them to the paper and are therefore not very sharp and poorly cut . The other brand's finer grit seemed to work better (removes material faster) and last longer than them. I would not buy them again but would buy a different brand. Update 8/5/18: After I posted the above review, the seller contacted me to buy a better review or remove my review. It seems to me "all mixed up". I wonder how many of the existing high ratings are "bought". Here is the text of her message: Hi Kevin! Sorry for the inconvenience, thank you for taking the time to leave your feedback and let us know about the issue. Two star rating and said "cuts badly." your satisfaction. We would like to refund you $5 as compensation. Can you help us remove your review or upgrade it to 5 stars? If our efforts can make you happy and satisfied, we hope to get your feedback. Please let us know if you need our assistance. Many Thanks. Lots of fancy customer service
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