If you have any of the big lenses like 400mm, 500mm, 600mm, and 800mm, perhaps you like to own it.
This is Arca Swiss B1g Ball Head which is very sturdy and strong for heavy gears.
It is used one and have some scratches but only in the Quick Release, other than that it is perfect.
Its competitive price is $500 but I can sell it for $425 only.
Let me know if interested.
Visit my Nikonians gallery