The Dunlop Super Bright 40-100 has been my go-to nickel strings over the past 15 years. I strung one of my basses with the SB last week and noticed that the A string sounded very dull. I emailed the Dunlop customer support. A box from Dunlop just arrived at my home. Inside there were “two new 40-100 sets”. When I contacted them, I hoped they would send me a replacement single A string. Dunlop’s customer care totally exceeded my expectations. Thank you, Dunlop.