Unknown years of use G string C string - Brand: OBLIGATO - Model: Viola Strings - Gauge: Medium - Material: Synthetic Silver - Material: Tungsten-Sterling Silver Thank you for viewing. These strings were on an instrument I purchased used, so the years of use are unknown. There is some rust, but please feel free to try them. A desiccant is included, and they are stored in a zip-lock bag in a dark place. To save on shipping costs, the default shipping method is regular mail. If you prefer anonymous shipping, please let me know in the comments beforehand. I will adjust the price.