5 regular first. I needed to replace those and opted for a pair with velcro. It would be a great gift for someone who loves wine. ( very big feet ). These ear hooks have a wire inside so you can mold them as needed. Neck is fused with steel. These do exactly what they are meant to. The materials used are definitely premium, and the design and construction are impeccable. I use a standard 5v usb connected to the USB C. Works on switch, you have to change the Nintendo Switch default settings to allow the microhone to work.