Ultra Reverse blades are our top selling scroll saw blade. They have a unique design where every third tooth is reversed to prevent splintering on the underside of the project. They also have an aggressively fast cut, while at the same time being a smooth cut. The Flying Dutchman Ultra Reverse Five Dozen Scroll Saw Blade Variety Pack comes with one dozen of each of the following sizes: #2/0, #1, #3, #5, and #7. Flying Dutchman scroll saw blades are 5" long and are pinless. They are all milled blades, which makes for a sharper cutting edge. Flying Dutchman blades are manufactured in Germany with top-grade, high-quality hardened steel.