Rihanna brought the Knucklecase to fame last year when she sparked a craze for this faux-knuckleduster-turned-tech-cover. And as a result of that, eBay banned the sale of metal versions when they began to be used as weapons. Nice.

knucklecase for iPhone

She’s not the only celebrity enamoured – though how in love with theirs Cameron Diaz and Megan Fox are is anyone’s guess going by the pusses on them above – and if you too really feel like life ain’t worth living without a four finger handle for your iPhone, then you can get one too for, gulp, $79 for classic silver from knucklecase.com.