Tips: In order to avoid scratching your fingers, these blades are wrapped in a rubber cover, Please pull them out of the cover during use. These knife blades for must be adjusted manually according to different cutting materi. Compatibility: These replacement blades are fully compatible with for Air 2/Air 3/Maker/Expression, suitable for cutting machines. 3 Size cutting effect: There are 3 different sizes of blades for cutting different materials, 30 blade is used for thin media: window , film, rice paper, 45 blade is for the standard blade, suit for paper, vinyl, sticker, adhesive foil, 60blade suit for deep media: fabric, cork, magnet and leather, thick card stock. Cutting & : These replacement blades are made of quality tungsten steel, and durable not easy to rust, you can cut your project fluently and cut clean with no dragging and no skipped spots. Product name: Die cutting replacement. Size: 23.5x2mm colour: as shown Material: tungsten steel Package Contents: 10 x 30 degree fine point cutting replacement blades (yellow cap) 30 x 45 degree standard blades (red cap) 10 x 60 degree (blue cap) Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.