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 clarity and definition, combined with 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.