"Unfortunately my male chin passed before I could find out if he liked these or not. I decided to give them a go for my female chin since she seems to be so picky on what she does chew on. They are light weight, so she loves throwing it around, and just carrying it around in her cage. She is very particular on how her cage is set up, so its easy for her to place them where she wants. The are usually gone with in days sometimes overnight. I would recommend these, I am not sure if they help her teeth like wood or stones do, but she sure loves them. The keep her entertained for a while. So I would suggest this for other Chinchilla parents."