Aquila USA 112U High G Concert Ukulele Set - All Lava Nylgut Aquila LAVA Concert Ukulele strings for Regular GCEA tuning For Concert Set High G. Made from Aquila's Supernylgut Material Colored Gray-black inspired by "Volcanic Rocks" Gauges, tensions: .62 mm, 4.1 Kg - .80 mm, 3.5 Kg - .95 mm, 3.3 Kg - .67 mm, 3.7