The teeth on these steel blades are carbide tipped, so they'll last longer and produce a smoother cut than other band saw blades when cutting fiberglass, plastic, and composites. Tooth size and number per inch are constant throughout the blade, and the teeth are set to the left and right in a repeating pattern. They're also known as raker-set blades. Choose blades with more teeth per inch for a smooth finish; choose blades with fewer teeth per inch for fast, rough cutting. They have a welded seam and are ready to install on your saw.