In this study, hybrid composites reinforced with Carbon short bers and alumina short bers were optimized using low-pressure casting. The total fraction of bers in the composite was 10 vol%, with equal parts of Carbon short bers and alumina short bers (i.e., 5 vol% each). For comparison with the hybrid composites, two composites were separately reinforced with 10 vol% each of the Carbon short bers and alumina short bers. All the composites were fabricated using a low-pressure casting process by in ltrating molten Al (A1070) into a preform. Both types of short bers were randomly distributed inside the Al matrix, and the low-pressure casting method achieved dense hybrid composite materials (over 98% relative density). The Vickers hardness and thermal conductivity of the composites were investigated.