Meine ersten Birkenstock. had to look at a video on line to see how this fit, but they work and we have had no problems. Thus, landing a pair of earbuds for under $5 each, is a wise investment for anyone who uses them regularly. It is metal, chrome dipped. I have very sensitive skin, so maybe this wont be an issue for most. I purchased these hoping that they would be comparable to the AKG set that was included when I purchased my Samsung S8+. My regular cans are Grados, an Audio Technica, and the Sony WH-1000XM3 bluetooth headphones. The three wrap around straps tend to bunch together in the mid section instead of staying at the top, middle and bottom. Make sure you buy from Advanced Fitness. Tap It is totally crazy and everyone had fun.