The D'Addario NYL035W string is a .035-gauge (0.889mm) single silver-plated copper wound string. It is designed as a third (G) string, commonly used to improve articulation and brightness in classical guitar sets, or as a replacement string for Pro-Arte series sets. 

Key Specifications:Gauge: .035 (or .035w)

• Material: Silver-plated copper wound on a nylon core
• Type: Classical Guitar Single String (Alternative 3rd/G string)
• Model Number: NYL035W 

This string is often used as an alternative to the traditional nylon 3rd string, providing a more balanced, resonant, and less "tubby" tone compared to a plain nylon string.