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In composites, the reinforcements can be a whisker, fabrics particles or fibers. The whiskers possess a definite shape but are shorter in diameter and length of the fiber. The particles do not have any fixed shape or orientation whereas the fibers consist of a long axis and the two other axes in either circular or near circular shape [16]. Reinforcement addition in composites is generally done to increase the strength of the composite, however, they also serves other purpose of heat resistance or conduction, resistance to corrosion and provide rigidity. Reinforcements are responsible for either one all of the mentioned functions as per the requirements. The reinforcements are generally stronger than the matrix and are capable of changing failure mechanism of the composite. Figure 2.5 shows different types of reinforcements in composites.