Shimano 3/16" ball bearings. Suitable for front Dura Ace hubs HB-7400 and HB-7700 and Shimano HP-7400/7410 heasdsets. 

The also fit the FH-7800, 7900 and 9000, XT 780, M78x series and XT M8000 series rear hubs as one side (NDS) uses loose 3/16" ball bearings. 

They will also fit any shimano hub or headset that require 3/16" ball bearings and that is mot shimano front hubs.