Prim viola strings are solid steel core strings wound with high quality flattened chrome steel wire. Offering durability, easy response, and a bright sound, they are especially popular with musicians playing bluegrass and folk music; made in Sweden
I know these aren't the highest quality strings, but they worked great for our viola, which is heavy and had a muffled sound. The Prim strings really cut through and gave it some power. I'm very pleased.