Features: COMPLETE MOLECULAR MODEL KIT. Pack of 440 (290 PCS + 150 PCS) organic chemistry model kit, widely used to make organic structures, cyclic compounds, and biology models. VISUAL-LEARNING. 290 PCS (132 Atoms & 154 Links & 3 Orbitals & 1 Short link remover tool) 150 PCS Carbon 60 (60 Small Atoms & 90 Links). All atoms are color coded to universal standards, very helpful visually understand and demonstrate the structure of compounds and molecular geometry. FUN AND EFFECTIVE TO LEARN. This chemistry model kit with atoms centers, bonds, and orbitals helps you understand chemistry concepts like inorganic molecule, general empirical formula representations, and organic structures. LIGHTWEIGHT, PORTABLE. Packed in sturdy storage box with four compartments for storage and portability. Easy to store and carry. Rremover tool included to make the task of dissembling your molecular atoms model kit structures super easy and fast. NICE GIFT. Great educational present for high school student, friend, teacher. Specifications: Color: Multicolor Box Size: Approx. 23.5x17x7cm/9.25X6.69x2.75in Weight: Approx. 950g Material: PP Package Includes: 440Pieces Molecular Model Kit note: 1.Please allow 0-1cm error due to manual measurement. make sure you do not mind before you bid. 2.Due to difference between different monitors, picture may not reflect actual color of this item.