Is there anything worse than having a flimsy, lightweight keyboard sliding all over your desk while you type? Probably a lot of things, but not for Redditor ipee9932cd, who couldn’t find a keyboard case they liked so they went the extra obsessed mile to make their own using rock-solid concrete.

At a whopping 12 pounds it’s even heavier than IBM’s classic keyboards that typing purists obsess over, which means that no matter how furious you pound on its keys, it’s not going to budge. There’s a handful of ‘how I made it’ photos as well if you want to try building your own, but aside from building a box and filling with with properly mixed cement, the process isn’t terribly complicated.

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[imgur via Reddit via BoingBoing]