The 3 Legged Thing AirHed 0 Evolution 2 Magnesium Alloy Ball Head (Black) is a stylish head designed for mirrorless cameras that encourages precise adjustments and fast setup changes. Composed of a magnesium alloy, the sturdy head supports loads up to 66.13 lb, so it's suitable for all cameras and most lenses. The head features an enlarged knurled knob that operates the Arca-style quick-release clamp. Additional knurled knobs manipulate the ball head's pan lock and ball/tilt lock. The pan-lock knob features an inset tension control that affects the play of the ball's movement.