These are one of the most popular sub-micro servos around. They have good torque for their size and weight. Hitec includes a nice asst. of arms. Because of their popularity, aftermarket suppliers offer an extensive assortment of arms for special applications, such as extended length arms for extra throw required by most 3D type aircraft. Hitec quality, reliability,and low cost. It's a winner. I have bought these by the dozen at least once because they are probably the size I use most often.
I give this product 5 stars. Review by Hall, Victor