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Return& Item Quality control:
1 year warranty

Detailed information of the product:

• Made of 7075 Anodized Aluminum Alloy
  
• CNC Machined and Polished surface
  
• Narrow Wide tooth profiling ensures ultimate chain retention
  
• 4mm plate thickness make super stiffness and I-beam construction transfer loads without flexing
  
• Been tested on my own bike for 2 months and they can offer good performance
• Compatible for 9, 10 and 11 speed.
• 38t,40t,42t,44t,46t,48t,50t,52t&54t; 5 Holes
  
• Bolt Centre Diameter: 110mm, pls make sure that will fit  your crank arm
• Fit with most Road/CX/Track Crankarm: Shimano,SRAM,Raceface&FSA, but the BCD must be 110mm