I got these quickly. However, 4 hours after installing them on my Steinberger headless guitar with a regular string adapter, 2 of the upper strings (E & B) unravelled from the ball end and not where they are compressed by the adapter. This was at a gig and luckily I brought another Steinberger (with similar regular string adapter) that I strung with another brand of string and I was able to complete the show and get paid! I don't think I will ever buy them again. I will try the other 2 sets that I bought on a conventional guitar but won't and can't rely on them in a professional situation. I use stainless steel for the resistance to sweat that here in Florida is a way of gigging life. No problem with other brands.