OLYMPIA 80/20 BRONZE STRINGS DELIVER A STRONG, DEEP BASS RESPONSE WITH EXTREMELY BRIGHT AND CRISP OVERTONES. THESE STRINGS ARE MADE FROM 80/20 BRONZE. BRONZE 80/20 IS AN ALLOY OF 80% COPPER AND 20% ZINC. THESE SETS REALLY COME ALIVE AT THE DEEP END WITH A SOLID BOTTOM AND ARE CERTAIN TO BRING EXTREMELY BRILLIANT SOUNDING TONE.