Model    Package    P.S/cm                G.W/kg        N.W/kg  
R1812  1PC           68*18*33            8.5kg          7.5kg  
R1814  1PC           77*18*36            9.5kg          8.5kg  
R1816  1PC           84*18*40            10kg           9kg  
R1818  1PC           96*18*46            12kg           10.5kg  
R1820  1PC           102*18*50          13kg           11.5kg