SunwayFoto FB-Series FB-44II Classic Ballhead with Screw Knob Clamp, 66.13lbs Capacity SUNWAYFOTO brand Arca-Swiss compatible Accepts QR's from RRS Wimberley, Jobu, Arca Swiss, Kirk, Markins, etc. 66lb Max load Elliptical Ball for progressive resistance 50mm clamp w Bubble Level