Blades of this quality are rare and hard to find. All are stainless steel and each blade has a safety edge and comes sheathed in its own protecting sleeve. Stainless steel blades will not magnetize (which can cause pops in your tape splice) and the cutting edge is extremely sharp and long lasting. The edges of these blades have been scanned under microscopes and it was amazing how superior they are to anything else out there. A ragged tape cut (even in the microscopic world) can cause pops and other issues with your edit. BOX of 10. PRECISION MADE IN USA