Experience the ease of dry slide cutting with these leaf-shaped blades. The Acroleaf 15, 25, are superior thinning shears that glide through thick and coarse hair with absolutely zero pull. The Acroleaf 50 is a chunker, a texturizing shear with a cut ratio of 45-55%. The 15, 25, and 50 refer to cut ratio. Cut ratio, is the amount of hair cut out per 100 strands of hair. ie. A straight blade scissor cuts 100/100 hairs, while the Acroleaf Thinner K50 cuts out 50, or half of the panel pulled out. *This is a stylists tool in that it is great for working with long hair. ** This is not a barbers tool in that it has not been designed for scissor over comb. Building Material Cobalt Alloy Extramarise ll