Flying Dutchman Blades they cut straighter, last longer and leave you with less sanding to do. Manufactured in Germany with high-quality steel, these blades are cut to precise tolerances and it shows in the performance of the product. For added strength, the Reverse-Tooth blade design guarantees you less sanding time. All these blades are 5 inches long and Pinless. Most Scroll Saw blades only cut on the down stroke, which causes tear out on the backside of your project, but Reverse-Tooth blades like Flying Dutchman cut on the upstroke as well. . .giving each stroke a pass on both the front and backside of your material -- for a smoother cut all around.Top-grade high-speed fretsaw, hardened, with reverse teeth. Splinter-free finish on top and bottom surfaces.