Set includes:30 - 2.5cm Black Alkane Carbon Balls 20 - 2.5cm Black Alkene Carbon Balls10 - 2.5cm Black Alkyne Carbon Balls 25 - 2.5cm Green Halogens And Monovalient Non-Metals Balls 20 - 2.5cm Yellow Sulfur/Selenium Hexavalent Balls 20 - 2.5cm Orange Sodium/Potassium Monovalent Metals Balls30 - 2cm Red Oxygen Balls 30 - 2cm Blue Nitrogen/Phosphorous Trivalent And Pentavalent Element Balls30 - 2cm Yellow Aluminum/Chromium Trivalent Metals Balls 30 - 2cm Orange Calcium/Magnesium Bivalent Metals Balls125 - 1cm White Hydrogen Balls With Integral Bonding Lugs 150 - 1cm Bonding Lugs370: Total Number of Balls520: Total Number of Components