Features: brand new and high quality 45MM; 28MM. 2 Sizes: 45mm; 28mm. These rotary blades have clearly visible length marking on the surfaces for you to roughly measure the length when in use. DURABLE MATERIAL. Made of high quality alloy steel (SKS-7). Not easy to bend or break, has a long service life and a long-lasting sharp-edge that cuts cleanly through layers-of fabric in one-pass. EASY TO USE. Ultra-sharp and durable. Be-aware that theses blades are for sharp and keep away from children! FIT FOR. Perfect Blades for sewing, quilting, scrapbooking and for all types of arts & crafts. Easily cutting of card, fabric, fleece, vinyls, leather, cloth, felt, etc of up to about 8-16mm at once. VALUE PACK. Pack of 10 rotary cutter baldes replacement. Thickness: 0.3mm. 45mm rotary cutter balde hole diameter: 8mm. 28mm rotary cutter balde hole diameter: 5mm. Specifications: Color: Silver Type: 28mm; 45mm Qauntity: 10 Pieces/Pack Material: SKS-7 Alloy Steel Weight: Approx. 18g-43g Package Includes: 1Set Rotary Cutter Blades note: 1.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!