Molecular model set containing 290 pieces for making organic compounds Set consists of 122 atoms and 168 links for demonstrating single, double, and triple covalent bonds Set includes a link removal tool, making disassembly easier Detailed instructions with pictures of several organic and inorganic molecules are included Contents come in a durable plastic storage box This 290-piece molecular model set affords a visual demonstration of advanced organic chemistry topics . The set includes 122 atoms with are color-coded and vary in size representing the different elements; and 168 links for demonstring single, double, and triple covalent bonds. A link removal tool is provided to aid with disassembly. The included instruction manual provides a key to the various atoms and links, as well as molecular structures and model photos of several organic compounds. A durable hard plastic case measuring 9.3"L x 6.7"D x 2.3"H is provide to store the components. Included Pieces 26 Carbon (black, 4 holes) 6 Carbon (black, 3 holes) 6 Carbon (black, 5 holes) 42 Hydrogen (white, 1 hole) 12 Oxygen (red, 2 holes) 6 Nitrgen (blue, 4 holes) 2 Sulfur (yellow, 2 holes) 4 Phosphorus (purple, 4 holes) 12 Halogen (green, 1 hole) 2 Metal (grey, 1 hole) 2 Metal (grey, 2 holes) Included Links 6 2D-orbital, grey 6 2D-orbital, pink 60 Medium, grey 30 Long Flexible, grey 66 Short, white