brand new and high quality Features: Low density, high hardness and strength corrosion. Low thermal conductivity. Super duarable. Specification: Density: ≥2.48/cm3 Microhardness: ≥3500kgf/mm2 Flexural strength: ≥400MPa Melting point: 2450 ℃ Life for each material: Steel Shot: 2000-2500h, Quartz sand: 1000-1500h, Corundum: 500-1000h Material: boron carbide Dimensions: 35x20mm/1.38x0.79inch Bore diameter: 3mm, 4mm Color: Black Quantity: 1 Pc Note: 1.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1 x Sandblasting Nozzle