Earth-boring bit parts including hybrid cemented carbides and methods of making the same

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The invention provides a roller cone earth boring bit comprising a bit body (30) comprising a hybrid cemented carbide composite, a plurality of roller cones rotatably attached to the bit body, and at least one mud nozzle connected to the bit body, wherein the hybrid cemented carbide composite comprises a cemented carbide dispersed phase comprising carbide particles sintered with a binder, and a cemented carbide continuous phase comprising carbide particles sintered with a binder, wherein a physical property of the cemented carbide dispersed phase and the cemented carbide continuous phase differs.. A method of making a part for an earth-boring bit is also disclosed.