LRS Premium seaweed is tested and found to be FREE from over 400 possible contaminants and radiation. Packaged in a heat-sealed, USDA food-grade poly bag, it contains one ounce (30 gram) or approximately 22 sheets, measuring 4 x 7.5 inches. Trusted in the yellow tang captive breeding project due to lab test results verifying purity and quality, this seaweed is nutrient-rich and preferred over grocery store varieties for its quality control screening.