1.When you Contact this guitar string, all you could feel is the smooth feeling and the deep and resonant music 2.As for the material, inside it sits the high carbon steel which comes with good extensibility and elasticity, while the 430F alloy, the alloy including the titanium, molybdenum and nickel and so on, which is corrosion-resistant, covers its surface to avoid the oxidation from its inner part, along with the bright appearance and smooth feeling. Plus, it comes with the nanometre anti-rust coating treatment to bring a Contact of security 3. of comes with the ring design, allowing you to find its tail more easily 4.The soft, smooth feeling plus the wonderful tone could help you design your freely, along with the long lifespan 5.Once you don't need to use it, you could keep it close and place it for about 5 years, as the vacuum packaging could avoid the oxidation for 5 years in the condition of sealed The guitar string has strong durability, high glossiness, clear and profound timbre. For professional performance Specification: Type:Strings Theme:Music,Hobby Colour: Silver Material: hexagonal alloy Size: 1.14/1.65/2.03/2.54mm(4 Strings) Package Contents: 1 x guitar string Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.