The Shimano Tiagra level FC-RS400 10 speed chainrings are the perfect replacement for worn or damaged chainrings
The chainring teeth have been developed to work only in conjunction with Shimano HG-X 10-speed chains for improved contact providing more efficiency and improved power transfer
Genuine Shimano replacement chainrings for the FC-RS400 cranksets available in 50T (Outer ring), 34T (Inner ring) 
Shimano part numbers: 50T-NA - Y1VM98010, matches 34T-NA - Y1VM34000
Compatible chain Shimano HG-X 10-speed