Gamma TNT 2 Squash String comes in 18 gauge. Gamma, a leader in the tennis string market has now launched 3 new squash strings for 2011. The TNT2 Squash string is a premium multifilament featuring Gamma's Livewire technology. This is a perfect string for the player looking for a multifilament string with texture. Offering great ball feel and control, this is a string that measures up to SuperNick XL.