... Single Drum Vibratory Roller Hydraulic vibration system, double-frequency and double amplitude. Static linear load 425 N/cm JZZ20 Compactor, road roller9.5ton Single ... ,low emission and low noise.2,The hydraulic vibration system,double-frequency and double amplitude,imported variable ... MIDDLE EAST, EASTERN ASIA AND AUSTRALIA. JZZ20 Road Roller (Compactor),Single-drum Vibratory Roller, Drum width 2178mm