ERNIE BALL Slinky COBALT 2723 0.09-0.42 Electric Guitar Strings New, unopened. I also have other small items for sale, so I'd appreciate it if you would consider them together. No returns or exchanges. - Brand: ERNIE BALL - Model Name: Slinky COBALT 2723 - String Gauge: 9-42 (I have up to 3 of the same stock, so if you want multiple, please contact me in the comments section)