The Hammermill Paper 99.99% Jam-Free Guarantee: You will not experience more than one jam in 10 000 sheets using Hammermill copy paper on your high-speed digital printer or we will replace your Hammermill paper purchase. We test more than 13.5 million sheets of paper every year to make sure that each sheet is consistent. Then we test our papers on all kinds of printer and copier equipment to ensure that our paper will work well for you every time on every machine. ?It?s More Than Just Paper? to us and to millions of sustainable forestry workers across America including American family tree farmers. Hammermill papers are made with renewable resources from certified sustainably managed forests. We want our business to last for generations and that means taking good care of our environment.