They are plastic. Pictures are very deceptive. The design is tailored to the place of their installation. But if you don't have a lid or lid on your drink of choice (and even if you do, like coffee lids with a drinking hole), it'll rattle, vibrate, and spill your drink all over the place. I mean, it's a Jeep and they're not known for soft, smooth suspension. So no problem for cola with a lid. And here is a cup of coffee without a lid and lid, good luck with it!
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