The Shimano Ultegra FC-08 11 speed chainrings are the perfect replacement for worn or damaged chainrings
HOLLOWGLIDE, hollow outer chainring technology, giving vast improvements in rigidity and increased weight savings, whilst also removing outer chainring flex, hugely improving shift performance making it precise even under high load
The teeth have been developed to work only in conjunction with 11-speed chains for improved contact providing more efficiency and improved power transfer
Genuine Shimano replacement chainrings for the FC-08 service replacement cranksets available in 52T, 50T, 46T (Outer ring), 36T, 34T (Inner ring) 
Shimano part numbers: 52T-NH - Y0V398070, matches 36T-NH - Y0NG36000, 50T-NK - Y0V398060, matches 34T - Y0NG34000, 46T-NH - Y0V398050, matches 36T-NH - Y0NG36000
Compatible chain Shimano HG 11-speed