Click to expand Tap to zoom Lung organ by Giant Microbes Sold in Units of: 4 Current stock: 37 Sale SKU GMO-3021 4 8 12 16 20 24 28 32 36 10+ Quantity Quantity Add to cart Your two lungs are the main organs of the respiratory system filling most of your chest. This colorful get well gift is for people post-surgery or a fun, educational learning tool.