Specific Gravity: 2970-3070kg/m3 Compressive Strength: 245-254Mpa Shore Hardness: Above 70Hs Material:Ji Nan Black. The first we should tell you ,our well-beloved customers,we are a professional manufacturer in shandong ,China,All of our product are directly out of factory and to your country.Our main products are granite inspection tables, squares, straight edges, square rulers, parallels, V- ...