Shimano dura ace 7900 cassette chain bundlefor all challenges and conditions the perfect hyperglide 10 speed cassette meets all demands featuresaluminium carrier super light and ridged in designsprocket lighter updated design for reliable shiftinggear combinations a wide selection for all needstitanium sprocket the 4 biggest sprockets are titanium to save weightchain select from our range of shimano and kmc chainsa 2 year warranty is offered with all shimano products from chain reaction