Gauges: 45, 63 Tapered, 85 Tapered, 105 Tapered Stainless Steel 4-String Long Scale These stainless steel bass strings sound clear and defined with an aggressive midrange and a solid bottom end. Robert Trujillo's powerful attack and monstrous tone have earned him the most coveted bass chairs in rock. The Robert Trujillo Icon Series Bass Strings were developed with Robert to give him the power and tonal flexibility to hold up under the demands of his rigorous playing schedule. These strings offer a clear articulate top end, solid midrange punch to cut through a wall of guitars, and more than enough focused bottom to knock you on your ass!