Material: Aluminum alloy (surface oxidation),Tungsten steel(blade)30,60,45design fits most of cutting plotter.High quality and extra Long life.Super wear Resistance,high hardness,Application:fit for and most domestic and imported plotterCarbide tip with higher hardness (HRA93),higher hardness,greater strength, tip more sharper,cutting plotter lettering fasterNote:Lighting,display and other factors may cause COLOR SHADINGColour:Photo ColorMaterial:steelSize:Full length: 23.5mm diameter: 2mmPackage Contents:20 x 45 degree red knives20 x 60 degree blue knives4 x tool holderOnly 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.