... 4.Hydraulic & vibration system 5.USD17,500Fob Changsha Block Machine Model JW-QTY3-20 1.Block Raw Material: Concrete / Cement / ... ,600 Hollow blocks400×200×200mm34503,600 Superiority of the Model:1.Block raw materials are of environmental protection,2. ... raw materials are applicable5. Nature of blocks produced by this model: High density; anti-freeze, good impermeability; insulation, heat insulation, ...