It arrived on time. It was extremely easy to assemble. The pelicans are 18?[Remember the equation is x-7/2 so these are 23-7/2 = 8 db lower sound - additional ear plugs add 5 so that makes this 13]Cons. Vielen Dank. This rack is not stable with the nuts it comes with. 25? in diameter) which is only half true. Easy to place attach to my Jeep Wrangler Tire in less than 5 minutes. I love the versatility to move the bars up and down, use one bar (for dresses) between supports or two for shirts or jackets. If you try to lift this rack up stairs or over a curb by grabbing the upright poles, the pole you grab will pop out. Pianos and acoustic guitar are pretty clean.