... -Strings 3.Option Color: NI CR CS BK BS BN GD This item BK-9 is in high quality and reasonable price.As ... them.Option Color: NI (nickel), CR (chrome), CS (chrome satin), BK (black), BS (black satin), GD (gold), BN (black nickel),. We ... for inspection if in stock... Tune-o-Matic Bridges &Tailpieces BK-9