Tecnifibre Black Code 4S 17 - square shaped poly to provide maximum bite on the ball.

Designed for big hitters who want a durable, low-powered co-poly with plenty of spin potential and impressive tension maintenance, Black Code 4S is a co-polyester tennis string from French manufacturer Tecnifibre. It features a square shape with four spin-friendly edges. 

Along with the square design, Tecnifibre uses what they call Thermocore Technology, a multi-stage heating process designed to soften the structure and reduce harsh impact vibrations. 

17 gauge provides more bite due to it's thinner diameter compared to 16 gauge.

Gauge: 17G / 1.25mm

Colour: Black

Length: 40 feet