Hmm, I just looked at my other guitars that might have nitro finish on the necks. This statement quoted earlier narrowed my search a bit: Please note, if your guitar is uses nitro finish, we strongly recommend not hanging or setting the guitar in a guitar stand/hanger outfitted with chemically active synthetic/surgical tubing. Doing this may cause a chemical reaction with the nitrocellulose finish on the neck (ex: CE, Swamp Ash) or the body (ex: Modern Eagle, DGT, Sunburst Series), which could cause the finish to dissolve. I only have a CE (old core version) and a SAS. The CE already had some nitro melt damage when I got it, presumably from a non-safe hanger. I see now the SAS has some very minor discoloration, and I honestly hadn't looked for it before, so I am not sure whether it was a "pre-existing condition", since I bought that used (a 2007 model, about 10 years old when I bought it). I thought I was safe using String Swing hangers, now I might just go put hanger covers (I was going to use a different term that starts with "co...") on several of them. Growf.