The Polyfibre Black Venom tennis string is designed for professional tour & topspin players looking for a great combination of power, touch & spin. It uses revolutionary SMD (Standardized Molecular Distribution) technology for long-lasting resilience & enhanced shot control & ensures extra spin potential & minimised string slippage due to application of olefins & special corona coating. This monofilament string is supplied as a set of 12.2m (40ft) & features a textured surface structure for a better feel & maximum comfort.