Purple is Coco Gauff 's favorite color and the tonal purple design of the BOOM ALTERNATE MP UL - which is endorsed by Gauff and Lorenzo Musetti - offers a striking and progressive look that matches the racquet 's explosive feel. UL stands for 'ultra-lightweight ' and this is a new racquet in the BOOM series that is even lighter, and more powerful, than the MP and MP L models. This fun-loving racquet, which is ideal for beginners who are looking for easy, effortless power and who like to attack, is part of a BOOM series that offers the highest power level in the HEAD range. That explosive power is combined with the touch to play delicate drop shots. Head Boom MP UL Tennis Racquet - Unstrung | Purple | 4 1/8 | Christy Sports