Graphite Pencil Lead 1) Dia:4.0mm 2) Hardness:10B; 3) Length: 185mm; 4) Certification: EN71-3, ASTM F963 ... 3 Graphite Pencil Lead 1) Dia: 4.0mm; 2) Hardness:10B; 3) Length: 185mm; 4) Certification: EN71-3, ASTM ... 08, ST2002-3 ProductGraphite Pencil LeadMaterialGraphiteGradeStandard QualityColorBlackHardness10BShapeRoundDiameter4.0mmLength185 mmWeight4.6948 g/pc· Note: If you have any question, please ...