The 12Pcs 5 Inch Pinned Scroll Saw Blades TPI 10/15/18/24 are made of carbon steel and are perfect for scroll saw works on various materials such as hard and soft wood, plywood, plastic, and chipboard. This pack of saw blades includes 3 blades for each of the 10/15/18/24 teeth, making them ideal for DIY enthusiasts. Please note, the color of the item in the picture may differ slightly from the actual product due to lighting and display differences. The measurements may vary by +/- 1-3cm.