Has anyone tried this sort of extension (it’s one piece attached around the crown with a wire)? If so what do you think to them. Are they easy to put on, can you hide the wire easily and has anyone any idea if the wire would be visible if my hair is in a very short bob (jaw length) and is thin and fine ? Thanks. I’ve just had my hair cut and I hate it. I’d have proper extensions but my scalp is sensitive and my hair too thin and when I tried them it caused a lot of damage and lots of the extensions just came out really quickly.