Square X Sharp

Ytex Square X Sharp is a co-polyester string. Co-polyester suits competitive players who prioritize control and spin — its low-powered character rewards full, aggressive swings. See community reviews for individual player feedback.

Durability varies by swing speed, string pattern, and play frequency. Co-polyester strings like Square X Sharp are among the most durable options available, though they lose tension faster than other materials. See the characteristic scores above.

Co-polyester strings are generally stiffer and can increase arm stress at high tensions. Players with elbow or shoulder concerns should string Square X Sharp at the lower end of their racket's recommended range, or consider a multifilament or natural gut alternative. Always consult a professional for tennis-related injuries.

Start in the middle of your racket manufacturer's recommended tension range and adjust to taste. Co-polyester typically performs better at slightly lower tensions — this increases comfort and maintains the string’s control properties longer. Check individual reviews above for tension preferences from verified Square X Sharp users.