This blade of this 45mm cutter is replaceable. Each cutter set also comes with 8 extra replacement blades - 5 for straight lines, 1 for cutting, 1 for dotted cutting and 1 of big dotted cuttingThis 45mm blades are made of -7 steel, staying sharper so there, you can cut multiple layers of fabric, paper or other materials precisely with the help of sewing .This 45mm cutter with blades is easy to use. This cutter anti- handle is ergonomically designed to reduce joint fatigue. which is more convenient to use.Your safety is top priority. This cutter is designed with a safety button to lock the blade, If not in use, the cutter can be withdraw to prevent the children hurt. sewing cutter leather help you to precise cutting on multiple layers of fabric, paper, vinyl, leather and more.colour: silver + orangeMaterial: metalsize: blade: Thickness:0.3mm, Diameter: 45mm. cutter: 7.5 X 2 inchPackage Contents: 8 * 45mm rotating blade1 * 45mm rotating toolUSE TIPS: 1. Sharp blade, please be careful to use,do not put in place where children can reach. 2. If the long-term not in use , please drop some of the oil in the blade head to increase of service life. 3. The use of consumables, due to different personal use habits lead to different usage periods. 4.A cutting mat is recommended to preserve the life of the blade.Only the above package content, other are not included.Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Minnanxin