A Gri Gri is a belay device which automatically locks in the event of a fall. Because of this it can be slightly harder to pay out the rope, however many climbers are happy to overlook this as the Gri-Gri is a very good belay device. Many indoor climbing walls use Gri-Gri’s when teaching young climbers to climb because of the auto locking feature. A new version of the Gri-Gri (known as the Gri-Gri 2) is soon to be released. According to the official website, the device will be able to take a thinner rope size, be 25% smaller and lighter and feature a more progressive descent control system.
A Petzl Gri-Gri.