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This iPhone case will tone your biceps while you fiddle on your iPhone

From a stethoscope to a stun gun, there’s no denying the increased quirkiness and arguable usefulness that these iPhone cases bring to the table. However, what if you wanted to buff up every time you picked up your iPhone for whatever reason? Enter the ToneFone.

Simply put, the ToneFone is a dumbbell. It is made from 100 percent British steel that feels nice thanks to the rubber coating. You can choose between a 1-kilogram (2.2 pounds) or a 1.5-kilogram (3.3 pounds) variant of the case for $38 or $42, respectively. Unfortunately, both options are only available in white. If you’re looking for more color options, gold and space grey versions should be available in June.

Speaking of availability, if you thought that no one would buy the ToneFone, you might want to rethink that. According to an update on ToneFone’s product page, the initial batch sold out. You can still, however, pre-order it and expect it to arrive at your doorstep sometime in April, though if you live in the U.S., you’ll have to fork over $11.50 more to cover shipping costs.

The ToneFone is fitted for the iPhone 5 and 5S and doesn’t obscure access to the charging port or headphone jack, though you would be unwise to use it with any iPhone stand.