My bunnuggets love willow barbells that I buy at PetSmart, but I'm sure Petco has similar things. Also, the willow rings, etc from BinkyBunny are awesome too! They can eat them and tear them apart and they are lightweight enough for them to throw around. I also bought some rings that are intended for babies....they are hard plastic, different colors and they make a chain when put together. I hang balls, or the willow things from their cage with them also. Hours of entertainment!