In present paper a new composite materials of (polyester/ (GF, SiC, PVC, Cu)) was prepared and studied to be used in gear applications. Samples were prepared with range of short length fiber (0.02-0.08 mm) and the weight fraction of E-glass fiber varying from (0-25)% . The best sample according to the wear resistance criterion was selected and some additives were used to improve impact, tensile, hardness, and thermal conductivity . These additives are 5% SiC, 6% PVC and 4% Cu. Samples properties were evaluated by using standard mechanical and physical testing. The results show improvement in all mechanical and thermal properties. Although the tensile strength decreases with increasing volume fraction of fiber content.