Browning wanted it's knife users to experience functionality in not just one knife, but several. This is the Browning 323-64B replacement blades pack, suitable for the Mirage folding knives, model numbers 322653 and 322654 which have additional blades you can interchange as easy as changing your razor blade.
Using surgical GIN5 steel (which is extremely sharp, and should be kept out of the way of children), these medium blades are strengthened to last a long time.
Each blade is 3 inches in length - one is super-sharp and one is serrated - only you can decide which one to use!