The V Weight Pouch can be used to add trim weight in the center groove of a set of doubles between the cylinders and backplate. Perfect for trimming double AL-80's, which otherwise become too buoyant at the end of the dive. The pouch measures { 11 in | 27.9 cm } from center to center grommet for a universal fit on the cylinder band bolts held in place by the backplate. One nice feature of the pouch is you can precisely adjust the amount of weight (Lead shot) you add based on your needs and the type of plate. Simply add up to { 5.5 lb | 2.5 kg } of #5 lead shot into the front and back compartments of the pouch, and the double Velcro® closure guarantees the opening will remain sealed. For extra security, we like to put a cable tie on the closure. Shot weight is not included, we just cut the corner off an ordinary soft bag weight and pour the shot into the V-pouch.