Lenox Gold 12118G - 12" 18TPI Titanium Edge LAZER Heavy Metal Cutting Reciprocating Blades - 5 Pack has specially formulated Titanium edge which improves the wear resistance of the teeth for faster cuts through the blade"s life. The bi-metal technology flexes, resists breaking and also extends the life of the blade. The reinforced tooth design and Titanium coating combine to create the longest lasting blade, ever.