Pirastro Permanent Viola set: 

Permanent by Pirastro is a steel string with a warm, round sound and a clear overtone spectrum. With a pliable left hand feeling, it produces a smooth lively tone. Stable with a very easy response, it is suitable also for electric or electrically-amplified violas.

Set Includes:

• Permanent Viola A - Chrome/steel: Medium, Ball End
• Permanent Viola D - Chrome/steel: Medium
• Permanent Viola G - tungsten/rope core: Medium
• Permanent Viola C - tungsten/rope core: Medium