This is a weight lead plate for use with the World Dive Dry Suit version 2 (sold separately). Weight lead (1.7 oz (500 g) per lead) is made into a board that fits the body. The weight lead plate is distributed in 5 locations for dry suits. 2. The buoyancy adjustment is easy. This product is sold as a single item of weight lead board, so the weight vest version 2 is sold separately.