The XT front hub comes in two versions, HB-M760 & HB-M765.
The HB-M760 is a standard front hub and weighs 150g.
The HB-M765 is designed to be used with the centre lock disc rotors (SM-RT77) and weighs 180g.

They both roll along on a cup and cone configuration with stainless steel ball bearings. Ball bearings are able to displace lateral and vertical loads more effectively, and also allow for easier maintenance.
They have a double contact sealing to stop all the elements and crud entering the bearing surfaces.
These hubs are as robust as they look.

Available in 32 or 36 hole spoke configuration, and either a black or silver anodised finish.