Is the text "Yama-kei JOY" from an original print related to a supplement, collaboration, or past campaign of the Japanese mountaineering magazine "Yama to Keikoku"? The material is likely aluminum. This item was inherited from my father. There are no leaks. The metal fittings have gaps, so I think it would be better to replace them with carabiners. Details are unknown. Please check the photos. I will answer any questions you may have about what you can see. I'm selling this as a used item (3C condition).