Ashaway ZyMax 66 Fire is a 0.66mm string, tailored specifically for players at the high performance end of the spectrum. ZyMax 66 Fire is designed for precise shotmaking and is recommended for players that like a stiffer, more control-oriented string bed. ZyMax 66 Fire has superior toughness, tension stability and durability at all tensions when compared to all existing micro gauge badminton strings on the market.