Sapim C-X Ray Straight Silver Straight-Pull Bicycle Wheel Spokes - Bag of 20 - GIS-SP Produced from high-tensile fatigue-resistant 18/8 stainless steel that conforms to the SAPIM quality Unbelievably high fatigue test results (3500000 wheel revolutions before failure) Stronger than all spokes currently on the market Almost as light as titanium