Store › Ernie Ball Super Slinky Cobalt 09-42 Ernie Ball Super Slinky Cobalt 09-42 $23.99 Brand: Ernie Ball Category: Strings SKU: EB2723 Availability: In Stock Purchase Added! Brand: Ernie Ball Category: Strings SKU: EB2723 Availability: In Stock Reviews Reviewer Name Review Date Star Rating Description Posted on Etsy Product Show More