The Manfrotto 504X Fluid Video Head & Aluminum Tripod is a medium-duty fluid-head kit.  
Key features include:
14.3-lb. maximum capacity
Four-step counterbalance
Flat base w/ removable half ball
Mid-level spreader
504X Fluid Head. The Manfrotto 504X Fluid Video Head & Aluminum Tripod expands upon its predecessor, the 504HD / 546B Tripod System, but in a lighter, more compact form. The large sliding quick-release plate allows for simplified balancing of front- and back-heavy rigs and its four-step counterbalance system enables smooth, precise movements for setups ranging from compact mirrorless systems up to full rigs weighing as much as 14.3 lbs.
Aluminum Twin Tripod. This aluminum two-stage tripod provides a sturdy base in a relatively lightweight package. It offers a maximum height of 60.24 inches and can support up to 55 lbs. The mid-level telescopic spreader prevents leg slippage when adjusting position on a fully loaded setup, while spiked feet with removable rubber overshoes keep everything steady on a wide range of surfaces.
Flat Base + Half Bowl. The 504X features an integrated 75mm diameter flat base and an optional half ball pre-installed for wide compatibility with high hats, sliders, and jibs. The tripod features a native 100mm bowl and pre-installed half bowl adapter for greater versatility.