From the manufacturer's official website:

Rear Derailleur for use with double gearing configurations.

Features:

• Wide link design: Wide outer link design increases rigidity.
• SIS-SP41 cable housing: The cable housing with silicon grease reduces friction by 10%.
• 9 & 10 speed compatible
• Weight: 209g

Specifications:

• Speeds 10-speed
• Max. Sprocket 27T
• Min. Sprocket 11T
• Max Front Difference. 14T
• Total Capacity 29T
• Guide Pulley sealed ceramic bushing
• Tension Pulley sealed bearing
• 11T Pulley Yes
• Bracket Body aluminum/clear coated
• Bracket Body Pivot Seal double O-rings
• Plate Body aluminum/clear coated
• Plate Body Pivot Seal single O-ring
• Outer Link aluminum/clear coated
• Inner Link aluminum/barrel
• Sealed Link Pins outer/inner link
• Link Pin Bushings fluorine coated (4)
• Outer Plate aluminum/anodized
• Inner Plate aluminum/barrel
• Average Weight 209g

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