☆ The manufacturer is unknown, but these are titanium frame glasses. ☆ The titanium frame is light, flexible, and very durable. ☆ The weight with lenses installed is only 13g, making them very light. (The installed lenses were, I believe, for presbyopia, around +1.0 to +1.5 diopters) ☆ I think the frame alone is valuable. ◇ Immediate purchase is OK, please refrain from price negotiations. ◇ If there is a significant oversight in the product inspection that affects its value, please ★contact me via message without rating the item★. Also, please be aware that there is no warranty for any product failures after the transaction is complete, as this is a used item.