Arriving fully assembled and ready to use, this tumbling composter is the easiest to use and most efficient we have found. It is constructed of 100% recycled materials (post-industrial polyethylene), is BPA-free, and includes aeration holes, a twist-off lid fully 1 foot in diameter, and a separate rolling chamber, so it can be removed from the base and rolled over to the desired garden spot. (No lifting, no spilling compost as you try to fill a bucket!) It measures 22" x 23.5" x30", weighs 27 pounds, and will last you many years. We love this composter!