Viola strings, Pirastro Obligato D, G, and C string set. Purchased from a musical instrument store in July 2025. I put them on my instrument and tried them for about a week, then removed them and stored them. I've decided to use different strings, so I'm selling these. I believe they haven't deteriorated much due to the short period of use. Pirastro Obligato Viola Mittel (Medium) D/G/C