Mine is plywood, with a chicken wire lid where the heat lamps sit on top as necessary. When it gets dirty, the chicks are temporarily put in a box, and the shavings are removed. I have a stick on lynolium bottom to prevent it from rotting. The new shavings layer does not cause a problem for slips as they walk on the shavings.I purchased the bin only. No new chicks or anything. I want to make sure it's clean and doesn't have any parasites, or anything like that, in it before I put my chicks in there.