11 speed. 6 pieces (R8000 STI levers with cables and housing, brake calipers - front and rear, cassette, chain, front derailleur and rear derailleur).
Note Sizes are Limited to: 11-25 Cassette
Use with 11 speed compatible crankset systems.
Buy a Shimano Ultegra R8000 STI 6 Piece Upgrade Kit from Texas Cyclesport, A Better Bike Ride Begins Here.