In an additional patented production process this hexagonal string is coaxially twisted and thermally fixed. Therefore creating a surface that is very rough, hence the spin properties are enhanced. Experience spin, ball bite and control of the ball at the highest level! The other winning features: Very durable - Extremely tension stable - No slipping of the strings - Huge Power. A top product made in Germany! Color: pearl-black. Gauge: 1.25 mm.