Every third hole has a small ?U? shaped notch to make it easier to identify the same level between posts. I would bet you could buy them for $1. They are not solid. 5 had a smidge more room in the length of the toe box, theyd be perfect. It came how it looked online. ?? Nowhere in the product description does it say that this also comes with a black, hard plastic inner shell(?) that fits within the silicone case. I laid them sideways on my countertop to use the top as shelf space as well and then a corner shelf to close innthe square space betweenthe 2 sincei have them adjacent inna corner. It took my husband and I about 45 minutes from start to finish. Sending both of them back for a refund.