Yonex Dynawire String Reel is a new update to the Yonex tennis string line. Dynawire uses a solid core construction for a crisp feel and durable response. The string also incorporates a unique metal film around it for a boost in power, and silicone coating to help the strings slide easily. Dynawire is a solid all-around synthetic gut string with a comfortable response, perfect for intermediate level players looking for string with excellent power and durability.