Low density, high hardness and strength corrosion. Low thermal conductivity. Super . specification: Density: equal 2.48/ cm3 Microhardness: equal 3500kgf/ mm2 Flexural strength: equal 400MPa Melting point: 2450 Celsius Life of each material: steel shot: 2000-2500h, quartz sand: 1000-1500h, corundum: 500-1000h Size: 35x20mm Hole diameter: 8mm colour:Black Material:Boron carbide Package Contents: 2 x Boron carbide nozzle Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.