The Gyb Easy Boom Brake was developed using technology from Wichard s Simond division, which makes mountaineering and ice climbing equipment. Based on the same principal as the friction brakes that mountaineers use to control their descent during a rappel, this simple device offers an easy way to tame otherwise dangerous gybes. It safely controls the speed of the boom s motion during a gybe, and also locks the boom in one position. The Boom Brake has three settings to adjust the friction on the line that passes through the device. Configurations of one, two, or three wraps are possible to accommodate different degrees of load. Recommended for mainsails up to 500sq. ft., it comes with 52' of 3/8" Gyb Flex line designed to absorb shock loads encountered during a gybe. Made of hard anodized 6062 forged aluminum Brake weighs 1.32 pounds Measures 4 1/2"W x 7 1/2"L Includes a 5/16" bow shackle rated for a safe working load of 2,650 pounds