Clear plastic, fold them yourself boxes to protect your carts because you're collecting/playing on a budget and cant afford to buy CIB units, or if you can, you aren't using them because OMGLABEL DAMAGE

The clear boxes are fine if you just want to place your games on the shelf and look at them, but it really was a hassle having to put together over 50 boxes, then getting games in and out was a pain, I am just going to order the small end caps and send these back, which is simple enough for my tastes.