Name:6v20kg-cm digital servo; size:a:40.2mm b:20.1mm c:38.8mm d:48.0mm e:10mm; weight:56g ±0.2(1.46oz); gear type:titanium gear; speed:0.11sec/60º at (6v) 0.13sec/60º at (4.8v) Torque:20kg.Cm.At(6v) 17.2kg.Cm.At(4.8v) the features:waterproof; plastic case, resist heat and corrosion; all aluminium hull, easy to eliminate heat;adopt high quality coreless motor. Size:a:40.2mm b:20.1mm c:38.8mm