There are many disabilities need help to do their daily activities. Prosthesis, such as metal have had always met the requirement because they are easily corroded, heavy and expensive. Therefore, engineers begin to developing innovative material in biomedicine, one of which is hybrid composites that is environmentally friendly. This research aims to find out whether carbon/abaca/polymethyl metracrylate (PMMA) hybrid composites can be used as an alternative material for socket prosthesis biomedical devices. Carbon/abaca/PMMA hybrid composites were fabricated using cold press molding and hand-lay-up method at a compressive pressure of 2.18 MPa for 60 minutes. Ratios of carbon fiber-to-abaca fiber 1: 3, 1: 2, 1: 1 and 2: 1 at 20% total fiber volume fraction. Tensile tests were carried out according to the ASTM D638 standard. Tensile test fracture structure was characterized using Scanning Electron Microscope (SEM) supported by photo macrographs. The results showed that tensile strength and modulus were relatively increasing in the increase of carbon/abaca ratio. At carbon-to-abaca ratio of 1:3 the tensile strength, modulus elasticity is 73.28 MPa and 4.01 GPa, respectively. At carbon-to-abaca ratio of 1:2 the tensile strength, modulus elasticity is 81.88 MPa and 4.49 GPa, respectively. At carbon-to-abaca ratio of 1:1 the tensile strength, modulus elasticity is 100.31 MPa and 5.87 GPa, respectively. At carbon-to-abaca ratio of 2:1 the tensile strength, modulus elasticity is 105.71 MPa and 6.19 GPa, respectively as the maximum value in this research. Optical and SEM micrographs showed that as ratio of 1:3 relative exist of pull-out fiber that make decrease value tensile strength but ratio of 2:1 relative decrease of pull-out fiber and make increase value tensile strength.