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Designed by a Professor of Organic Chemistry, each kit contains everything a student needs in an organic chemistry model kit. It has over 200 atoms and bonds. The kit is patented and is the only kit out there that can demonstrate resonance simply by twisting pi bonds. The kit was specifically designed not to allow a student to make an incorrect Lewis resonance structures! Parts are small and easy to use, NOT BULKY and SLOW! No TOOLS needed!