DR NEON Multi Color Coated Guitar Strings are NEON K3 Coated Nickel Plated Steel strings on a Hex core. DR NEON Multi-Color K3 Coated Strings do not sound or feel like coated strings. The new K3 Coated NEON Multi Color Strings make no apologies or excuses for not delivering a sound equal to uncoated strings. DR NEON Multi-Color Strings have great clarity and articulation while providing more protection from sweat or acid hands allowing for longer life and increased tone. All of the DR NEON Multi-Color 6 individual strings are K3 Coated.