The Standard Model of particle physics is the theory describing three of the four known fundamental forces (the electromagnetic, weak, and strong interactions, and not including the gravitational force) in the universe, as well as classifying all known elementary particles. This product is a set of 32 magnets. Each magnet is 35mm x 35mm (1.38 x 1.38 inches) and 1mm thick. They will stick to metal surfaces such as the metal white board shown. These are often called refrigerator magnets and will work similarly. They will NOT stick to the thick glass magnetic white boards or non magnetic metals or surfaces. White boards are NOT included.