The Ernie Ball Regular Slinky Bass String Set includes four roundwound nickel-plated steel strings with a string gauge of 50, 70, 85, and 105. Designed specifically for bass guitars, this set is perfect for players looking for a bright and punchy sound. The uncoated strings provide a clear and crisp tone, making them ideal for bass players in various musical genres. Please note that this product contains chemicals known to cause cancer and birth defects, so it is important to be aware of this warning when using it.