The Arca Swiss Monoball B1 is a heavy-duty ball head suitable for... well, anything that weighs less than 40kg. A solidly made, all-metal ball head with a uniquely designed elliptical ball that naturally increases tension as the ball goes off-axis to help you keep positioning control with heavy gear. Again, 40kg. The head is in excellent condition overall, with minor wear including a couple of corner dings on the QR clamp. Includes a genuine Arca Swiss camera plate.