Being the thinnest string in the alu power range the luxilon big banger alu power feel 120 tennis string is very conducive to spin and power play this set boasts 122m 40ft of string with a 17 120mm gauge and is made with big banger technology providing plenty of control and feel on shots to go with the excellent spin and power it is a monofilament string made from polyester and will encourage your confidence on the courts