100% new and high quality Characteristics: Low density, high hardness and strong corrosion. Low thermal conductivity. Super duarable. Specification: Density: 2.48/cm3 Micro-hardness: 3500kgf/mm2 Abdominal market: 400MPa melting point: 2450 Levels for each material: Steel Shot: 2000-2500h, quartz sand: 1000-1500h, Korund: 500-1000h Material: borium carbide Dimensions: 35x2 0mm/1.38x0.79inch Boring diameter: 3mm, 4mm Color: Black Quantity: 1 Pc Note: 1. Please 0-1cm error due to man