SUPERIOR MATERIAL:bottle cages are made of full 3K Carbon Fibernon-deformable corrosion resistantextra strength and durability combined with low weight ( only about 25 g) effectively reduce the weight for long-distance travelers.EXCELLENCE DESIGN:With smooth edges will not hurt your hand and kettle. Matt Black shows composed personality and brings you full sense of sports.FITS MOST STANDARD SIZES BOTTLES:This bottle holder fits most standard sized water bottles and adjustable oblong mounting holes.The bottle cage is around 2.83 inches (7.2 cm) in diameter fit bottle dai 2.79-2.95 inches (7.1- 7.5 cm) bottle too big or too small may not fit firmly.DESCRIPTIONS:Material: 3K Carbon FiberSurface treatment: MattDiameter: 71-75 mmNet Weight: about 25 g