These are the sturdiest snap blades we've ever seen. At 1" wide and 0.03" thick, they should outlast any snap blades you've ever used. They won't fit just any knife - you have to have a knife that's up to the quality of the blades. Our Tajima Rock Hard Aluminist Utility Knife (851303) is just the tool for these fine blades. Each heavy-duty blade has 6 snap off segments for a total of 7 cutting edges. Pack contains 10 blades.