Teeth vary in size, number per inch, and pattern to reduce vibration, so they create a smoother finish than Long-Life Band Saw Blades for Thin Metal. They have teeth set from side to side in a wavy pattern for cutting metal sheets and thin-walled pipe. They're bimetal blades with a carbon steel body and high-speed steel teeth that last up to four times longer than carbon steel teeth. They're flexible for making straight and curved cuts. Choose blades with more teeth per inch for a smoother finish; choose blades with fewer teeth per inch for fast cutting. All have a welded seam and are ready to install on your saw.