The Tecnifibre X-R3 1.25 tennis string has been designed to provide a firm feel, enhanced comfort & maximum power. This multifilament string comprises of three monofilament cores, PU 400 inside & Elastyl fibres. The monofilament cores provide a firm feel, increased control & enhanced durability. The Elastyl fibres are used to enhance power, while the Polyurethane 400 inside provides more comfort by minimizing shock & vibration. in addition, the string is coated with Silicone Pyrogene Lubritec that improves durability. The Tecnifibre X-R3 has a 1.25mm gauge & is available in a 12.2m (40ft.) set.