1. These explore replacement blades are fully compatible with Cricut Explorer Air 2/Air/Maker/Expression, suitable for Cricut Maker machines. 2. These explore replacement blades are made of quality material, sharp and durable not easy to rust, you can cut your project fluently and cut clean with no dragging and no skipped spots. 3. 45 degree standard blades are universal cutting blades, such as poster board, foiled card stock, poster board, and computer paper, vinyl, stickers. 4. 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 cricut must be adjusted manually according to different types of blades or different cutting material. Blade Length: 23.5mm Shank Diameter: 2mm Angle: 45 Degree colour:Black+silver Material:Tungsten steel Package Contents: 20 x Cutting Blades Only the above package content, other products are not included. Note: Light shooting 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.