Classic guitar strings made with clear nylon and special silver. Optima, a popular and standard brand in the mandolin world, has produced these classic guitar strings. They feature clear nylon high strings for a bright, well-defined sound, and silver special low strings for a rich, mellow tone. Give them a try! They are sold for around ¥5000. Made in Germany. - Brand: OPTIMA - Model: No. 6 - Type: Classic Guitar Strings - Material: Special Silver - Gauge: Clear Nylon Medium Thank you for viewing.