These servo gears are made specifically to fit a Futaba 3F servo spline, allowing you to mate other gears to your servo. They have 16 teeth with a gear pitch of 32P, an outer diameter of 0.563 inch, and utilize the 3F Futaba servo spline.
Actobotics is a robotics building system based around extruded aluminum channels, gears, precision shafts, and ball bearings. Thanks to the two standardized hole patterns, nearly all Actobotics components can be intuitively connected together. The wide range of components makes building complex electromechanical prototypes or finished projects a reality.