1、Made of fluorocarbon materials, the volume and pitch attenuation are not serious after long‑term use. 2、These strings can enhance the volume and tone of an ukulele or small guitar, while reducing the noise produced. 3、A label is attached to each string, so you won't be confused about the installation position, which is easy to identify. 4、As a universal ukulele string, it is suitable for three kinds of soprano (21 inches) / concert (23 inches) / midrange (26 inches). 5、The string feels soft, which is very suitable for beginners to learn stringed instruments and relieve the pain of the practicer. Item Type: Strings Model 1: TX-1, 21/23/26in Universal Material: Fluorocarbon Color: Transparent Size: Approx. 1-A String: 0.022in(0.57 mm) 2-E String: 0.029in(0.74 mm) 3-C String: 0.033in(0.85 mm) 4-G String: 0.025in(0.64 mm) Model 2: TX-2, 21/23/26in Universal Material: Fluorocarbon Color: Transparent Size: Approx. 1-A String: 0.026in(0.65 mm) 2-E String: 0.032in(0.81 mm) 3-C String: 0.040in(1.02 mm) 4-G String: 0.029in(0.74 mm) Model 3: TX-3, 21/23/26in Universal Material: Fluorocarbon Color: Reddish brown Size: Approx. 1-A String: 0.026in(0.65 mm) 2-E String: 0.032in(0.81 mm) 3-C String: 0.040in(1.02 mm) 4-G String: 0.029in(0.74 mm) 4 x Strings