High torque brother of the SRG-BR, offering the level of response & an impressive torque output to appeal to both off-road & on-road users looking for the durability & longevity. Metal gears & twin ball races are of course standard & the SRG-BZ can also use the Sanwa Super Response (SSR) system if required. Specification Weight: 63g Dimensions: 40.5 x 21 x 38mm Speed: 0.12 sec/60° (6.0v) Torque: 13.0 Kg/cm (6.0v) Manufacturer: Ripmax Model: SRG-BZ Digital Bless Servo (P-SWDSRGBZ)