Ashaway`s NEW ZyMax 66 Fire Power is a 0.66mm string, tailored specifically for players at the high performance end of the spectrum. ZyMax 66 Fire Power is designed for optimum repulsion, power and shot making. It is also beneficial for minimum tension loss and maximum strength and durability. ZyMax 66 Fire Power has superior toughness, tension stability and durability at all tensions when compared to all existing micro gauge badminton strings on the market.