A recent evolution in Rapid Prototyping is the direct production of metal parts. The main bottle necks are part accuracy and appropriate material properties. This paper describes the approach of selective metal powder sintering (SMS) where liquid phase sintering actions as the basic binding mechanism between individual metal particles. The merits and drawbacks of this approach are highlighted from metallographic point of view. Next, a few material combinations, which have been experimentally verified, will be described from point of view of performance in the SMS process. Simultaneously, solutions for problems related to this performance are proposed and discussed.