Someone recommended these to my mom when I was first learning how to play, so she insisted my sister and I always keep them in our instruments. She completely wanted to avoid damage from dryness. They are really easy to get in and out. Pull it out before you play, and slide it back in when you put the instrument away. If you don’t have a hygrometer (sp?) in your case, I think it’s a good idea to always have a dampit on hand.