What is a “multifilament” string?
Multifilament strings were designed to simulate the construction of natural gut using synthetic fibers. Natural gut is made from a fibrous muscle tissue found in beef and sheep intestines. Multifilament strings consist of bundled microfibers held together with a bonding agent. Generally, multifilament strings pocket the ball better than strings with center core construction. The ball seems to stay on the string longer which translates into more feel. My take on multifilament strings is that they play great initially, but the performance degrades more rapidly than with a center core construction. The reason for this is that none of the fibers in a multifilament string run the continuous length of the string. As a result, they are more prone to tension loss.