Hi Jackie D
The blades are replacement carpet cutter blades and the item # is 97642 they sell 2 for 1.99. On the back of the package it says Distributed Exclusively by Harbor Freight Tools.
I have been using mine since sometime last summer and I have to say they are cutting just as good as the Olfa blades. If and when they get a little dull I run them through folded aluminum foil just like I would the Olfa blade. They work for me.
Good Luck
Sue