ServoBlocks with Hub Shaft (Standard Hitec) (1) Servo Plate (1) Ball Bearing Plate (1) Servo Spline Shaft Hub (2) Hub Plates (12) 6-32 Screws Weight (no servo): 1.3 oz Perfect for robotics, animation, pan & tilt, and just about any project requiring servo power! Ball-bearing supported output shaft Servo Not Included