2mm Lead 4B Drawing Hardness Package of 12 by Turquoise

4B Turquoise 2mm lead has a perfectly graded hardness that’s produced from a mixture of crystalline graphite and super-refined clay. They are designed to fit most lead holders and clutch style pencils. Lead hardness is determined by the clay to graphite ratio; harder drafting lead has a higher percentage of clay than softer sketching leads. The Conté system is a popular scale for rating pencil hardness, with 9H measuring the hardest through 9B the softest. The 2mm Sanford Prismacolor drawing leads are popular for sketching and material applications, such as testing the hardness of paints and varnishes. Each lead is 5 1/8" long and .078" in diameter, packaged in a tray of 12, has a dimension of 7.25 x 1.75 x 0.75 inches, and a weight of 0.06 lb.