Description:Brand NewItem Specifics:This set is the same as "The Prentice Hall Molecular Model set for General and Organic Chemistry", with 9 additional atoms (1 carbon, 2 hydrogen, 2 oxygen, 2 fluorine and 2 iodine) and 10 additional single bond (space filling model) and 10 additional single bond (open model) and 8 additional double/treble bond (open model) and 4 additional coordinate/covalent double bond (open model). It can be used to build virtually all simple molecular models encountered in general and organic chemistry.This set includes 269 pieces of durable and fine quality plastic components, virtually indestructible, and come in a sturdy plastic case for storage.All shape and measurement of spherical atoms (some of them may not be included in this set)Four Types Of Links:Single bond, space filling model, 1mm length, transparentSingle bond, open model, 20mm length, white colorDouble or treble bond, open model, 35mm length, grey colorSingle bond, "V" shape, open model, 3mm length, white colorMaterial: PlasticColor: Multicolor（1cm=0.39Inches）Package Included:1 Molecular Model SetNote:1.Choking Hazard.Contains small parts, please prevent kids swallowing the small parts by mistake.Kids under 3 years old should be under the tutelage of parents when they play with this toy.2.Please allow 1-3cm error due to manual measurement. Please make sure you do not mind before you bid.3.The colors may have different as the difference display, please understand.