Full aluminum case 3 precision ball bearings. Unique steel gears specifications torque @ 6v - 40. 0kg/555. 5oz-in torque @ 7. 4v - 50. 0kg/694. 4oz-in torque @ 8. 4v - 65. 0kg/902. 7oz-in speed @ 6v - 0. 16 sec/60 deg speed @ 7. 4v - 0. 13 sec/60 deg speed @ 8. 4v - 0. 11 sec/60 deg dimensions l x w x h (mm): 40. 3 x 20. 2 x 38. 7 weight: 81g sav-sb-2290sg servo specifications total height (a) = 38. 7mm body width (b) = 40. 3mm below mount (c) = 25. 9mm above mount (d) = 11. 7mm total length (e) = 54mm total width (f) = 20. 2mm (sav-sb2290sg)