Being the thinnest string in the Alu Power range, the Luxilon Big Banger Alu Power Feel 120 tennis string is very conducive to spin & power play. This set boasts 12.2m (40ft) of string with a 17 (1.20mm) gauge & is made with Big Banger® technology, providing plenty of control & feel on shots to go with the excellent spin & power. It is a monofilament string made from polyester & will encourage your confidence on the courts.