From the manufacturer's official website:

The wide pivot link design boosts strength and rigidity. Flex is suppressed, creating sharp, precise shifts that are faster and smoother, even from low to high gears off of the saddle.

Features:

• Wide pivot link: Extra-wide pivot link increases rigidity while suppressing flex for improved shifting response
• Pivot location at cage moved to point of greatest force to reduce cage deflection.
• Narrower chain cage to accommodate 10-speed chain.
• DUAL SIS front index shifting
• Weight:74g (Brazed-on type)

Specifications:

• Model No. FD-7800-B
• Rear Speeds 10speed
• DUAL SIS Yes
• Top Gear Teeth 50-56T
• Capacity 15T
• Link Bushing upper & lower AB-pins
• O-ring Seals No
• Spring Cover No
• Chain Stay Angle 61-66 deg.
• Mounting band, brazed-on
• Chainline 43.5mm
• Compatible Adopter No
• Band Diameter 28.6/31.8mm
• Band/ Brazed-On Clamp forged aluminum/ anodized
• Outer Link forged aluminum/ anodized
• Inner Link forged aluminum/ anodized
• Chain Guide aluminum/ nickel plated
• Average Weight 74g (brazed-on)

For more information, please visit this product's webpage.