Our factory manufacture and export kinds of plasitcs injection parts. Economical & versatile, this student set does it all whether you are a chemistry major, engineer or biologist who needs 1 only chemistry credit. This set can build models for VSEPR theory or alkanes, alkenes, aromatics, sugars, amino acids & more! cyclohexane; 15 double thick bonds for chair-boat flips and parts for any of the 20 amino acids, sugars, fats and stereochemistry: chiral pairs, cis & trans and 14 orbitals for VSEPR theor one electron pairs; and lots of bonds for building lots more stuff such as: alcohols, thiols, amines, ketones, and more simple lattices such as diamond (not shown) compact ziploc bag fits pocket or purse (not shown) and comes with basic instruction guide (not shown)