If you’re knitting in public then they might be annoyed by the sound, but unless you’re interrupting a movie or other quiet place I don’t think it’s a huge problem. I tried Boye once and didn’t like them and don’t know anyone who uses them so I haven’t heard them for a long time. I think they are aluminum?. I prefer nickel plated or wood which are quieter I think. To each his/her own though.