My grandsons were coming over so Gammy could show them how to sew just a little bit, when they got here the 1st thing the oldest asked was "what is this for & can I use it" it was my rotary cutter I said No it's very very sharp so of course while clearing off the table sliced the side of my finger bled like a stuck pig. Grandson said your right Gammy I don't want to use that!