The Shimano Ultegra CS-6700 10 Speed Cassette gives you top of the line performance at a much more reasonable price. The tallest sprockets are attached to an aluminum carrier to cut weight while maintaining rigidity. The ramps of the Ultegra CS-6700 have been redesigned to be stronger and to give you faster and smoother shifting. The Shimano Ultegra CS-6700 10 Speed Cassette is compatible with all Shimano 10 speed drive trains. The sprocket sizes are 11-12-13-14-15-16-17-19-21-23. This cassette features an 11-23 ratio and includes a lockring and the technical manual.