Gerblets love the cardboard tubes, and generally don't eat them. It sounds like someone typing on an old typewriter when they get going on their chewing!
Gerbils are a lot of fun, I highly recommend them! They have several sleep/wake cycles throughout the day, and will usually adjust them to your schedule, so they can be awake and ready to play/receive treats while you are around. They also like free runtime if you can provide a space for them to sprint around in, my experience shows they did not like the run around ball either.
Make sure you have a sweater or long sleeved shirt that you don't care about that you can wear while they play on you - they love to tunnel through your sleeves, but they will chew holes in nanoseconds.
be careful though, as gerbils are very territorial and will chase your chins given the chance. ( I have stories)