[Application] - 45 degree blade used for most general cuts; 60 degree blade does the most intricate and delicate cuts; 30 degree blade should be recommended for fabric, thin cardboard and leather. [Cutting Material] - these blades replacement for silhouette used for cutting card stock, fabric, heat transfer material, transparencies, paper, vellum, adhesive vinyl magnet paper. [Precise and Sharp] - the point of these blades made by hard alloy with Hardness is very tough and durable. They cut the tiniest intricate details precisely and stay sharp despite of the long-time use. Note: these Silhouette blades replacement do not automatically adjust in the silhouette for depth needed to cut, and all blades must be adjusted manually for setting depth as a continuous variable. Compatibility:Fit For CAMEO 4 Colour:As Shown Material:alloy Package Contents: 1 x Housing Cutting Blades Kit Only the above package content, other products are not included. Note: Light reflection 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.