Is this roll of paper towels safe to use?

About five sheets in on this roll of paper towels there was something on one of the sheets of paper. I thought it was just a small mark that is sometimes in the paper but this came off. It was gray in color and about the size of a small pebble but flat. It looked like lint but was not at all it was slightly harder. What do you think it could have possibly been and will I catch anything if I dry my hands on those paper towels and then eat with my hands?