Blockhead Stem IB – Integrated Brake Lever from CW&T, a bicycle stem and brake lever in one.
"The lever is tucked neatly into the stem and is just long enough for two fingers. We designed it to be used with a front brake so the cable can be cut really short and straight, eliminating friction within the brake cable housing.
Sometimes it’s nice to ride fixed with a front brake, but brake levers tend to be massive, take up a lot of handlebar space, and have levers that are much longer than they need to be. Our solution is to make the lever part of the stem. If you despise your ugly massive brake lever, this one is for you."
For more info CW&T