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Kids tend to be mischievous in the classroom which is why Sebastian Bergne's Bandit Ruler would be their weapon of choice.

At first glance the Bandit ruler looks like any other ruler, but fancier. Look closer at the ridges and you'll soon realize they're there to secure elastic bands in place so that you have a better chance to hit that poor teacher who gave you detention. With the Bandit Ruler in hand, it'll bring back the naughty child in you.