Molymod molecular model sets inorganic organic molymod mms 004 molymod molecular model sets are the original dual scale quality system of molecular and atomic modelsscales open ball amp stick models 25cm angstrom closed semi space filling models 15cm angstromatom parts range from 17 to 23mm in diameterbonds single bonds are represented by medium links 19mm and multiple bonds by longer flexible links 30mm for compact models bonds are represented by short links 2m