I bought it for my chinchilla before I got her, the day I got her she started trying it out. I've now had her for around 3 months and she loves it, runs on it alot of the night, and get very uptight when im cleaning her cage and I touch it, lol. A+ shes never even tried to chew on it though if she did its metal she wouldnt get very far... I deffinatly reccomend it, for me it was worth every cent I spent on it. It's pricey but in the long run its better, no back problems, injuries, completly safe!