One thing that I recommend is if it has a slotted top/cover. Take some Duct tape and cover it on the top and bottom. It is a real hazard (IMHO) to have a open top while tumbling. All the dust full of lead and other toxic crud will fly out into the surrounding area. So if you use it a room or basement you will have build up of toxins all over. I use mine in the garage with the door open and use a shell sorter/sifter outside to remove the media.

If it has a solid top, you are good to go but still would not use it inside the home.

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Still Running Against the Wind