If your looking for all the extra edge you can get, these are for you. These high quality rear derailleur pulleys are an excellent upgrade to all factory brand rear derailleurs. Significantly reduce drivetrain friction by up to 60% with these high quality ceramic ball bearings.

• Size:
  
• 11 tooth- Compatible with all Shimano and ACCURA road rear derailleurs
  
• Super smooth high quality Sealed Ceramic Bearings- Up to 60% less friction
  
• Smooth & precise shifting
  
• Quiet Running Drivetrain
  
• Cog CNC Machined from 7075 Aluminum Alloy
• Weight: 9 grams each (verifiied)