No toy can prevent your rabbit from chewing on cords. You have to keep them from him by buying some kind of hard (the hardest you can find, he will chew through the soft ones) plastic tubes in which you can put electrical cords. You can find them in any hardware stores. It's a bit long to put on the cords, but a real life-saver and it's really cheap. I did that on my computer cords and everything else mine could get to in my room and it saved me a lot of grief.