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Narrow Wide Chainring so it's for Single ChainRing setup only, Won't work with Front Derailleur

Warranty and Return policy:
1 year warranty

• Made of 7075 Aluminum Alloy
  
• T651 heat treatment, Hard Coating Anodized
• CNC Machined and Polished surface
• Increased tooth height & Narrow Wide tooth profiling ensures ultimate chain retention
  
• 4MM Arm 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 11,12 speed.
  
• 38,40,42,44,46,48,50,52&54T Teeth,5 bolts
• 69g for 42 Teeth Version
• Bolt Centre Diameter: 130mm, please make sure that will fit  your crank arm
  
• Fit with most Road/CX/Track Crankarm: SRAM,Raceface,FSA,Rotor&Praxis but the BCD must be 130mm