SRAM X9 2x10 Front Derailleur (High-clamp, Dual-pull)

The X9 Low-Clamp Front Derailleur (image of High-Clamp version unavailable from manufacturer).
$61.00
Details
SRAM's X9 Front Derailleur sports an aluminum body, a stiff steel cage and a cutout design for exceptional durability with minimal weight. It provides, crisp, precise action for fast, smooth and reliable shifting season in and season out.

Your seat-tube diameter determines the needed derailleur clamp size.
Capacity is calculated by subtracting your smallest chainring's tooth count from the largest chainring's tooth count. Example: 46/34/24 chainrings: 46 - 24 = 22-tooth capacity.