Features 1、Designed for balancing chemical equations, advanced science learning. Nice for organic structures, cyclic compounds, and biology models. 2、Improve hands on ability and exercise children to develop g ood creativity. 3、Made of superb p lastic material, it is easy to install and long-lasting. 4、Comes with 4 diffferent optional molecular model kit for your diverse choice: for your different needed. 1# 122PCS Molecular Model Kit Set((59 Atoms Model+62 L ink Keys+ 1 T ool) 2# 179PCS Molecular Model Kit Set(76 Atoms Model+102 L ink Keys+ 1 T ool) 3# 240PCS Molecular Model Kit Set(86 Atoms Model+153 L ink Keys+ 1 T ool) 4# 444PCS Molecular Model Kit Set(196 Atoms /u0026 234 L inks /u0026 3 Orbitals /u0026 1 Short l ink remover tool) Specification Features: Designed for balancing chemical equations, advanced science learning. Nice for organic structures, cyclic compounds, and biology models. Improve hands on ability and exercise children to develop g ood creativity. Made of superb p lastic material, it is easy to install and long-lasting. Comes with 4 diffferent optional molecular model kit for your diverse choice: for your different needed. 1# 122PCS Molecular Model Kit Set((59 Atoms Model+62 L ink Keys+ 1 T ool) 2# 179PCS Molecular Model Kit Set(76 Atoms Model+102 L ink Keys+ 1 T ool) 3# 240PCS Molecular Model Kit Set(86 Atoms Model+153 L ink Keys+ 1 T ool) 4# 444PCS Molecular Model Kit Set(196 Atoms & 234 L inks & 3 Orbitals & 1 Short l ink remover tool) Specifications: Material: Platsic Types: 4(Optional) 1# 122PCS Molecular Model Kit Set((59 Atoms Model+62 L ink Keys+ 1 T ool) 2# 179PCS Molecular Model Kit Set(76 Atoms Model+102 L ink Keys+ 1 T ool) 3# 240PCS Molecular Model Kit Set(86 Atoms Model+153 L ink Keys+ 1 T ool) 4# 444PCS Molecular Model Kit Set(196 Atoms & 244 L inks & 3 Orbitals & 1 Short l ink remover tool) Item color: Multicolor Package size: 1# 2# 3#: 235 * 170 * 35mm 4# 230 * 170 * 70mm Package weight: 1#: 450g 2#: 560g 3#: 650g 4#:850g Paking list: Types: 4(Optional) 1# 122PCS Molecular Model Kit Set((59 Atoms Model+62 L ink Keys+ 1 T ool) 2# 179PCS Molecular Model Kit Set(76 Atoms Model+102 L ink Keys+ 1 T ool) 3# 240PCS Molecular Model Kit Set(86 Atoms Model+153 L ink Keys+ 1 T ool) 4# 444PCS Molecular Model Kit Set(196 Atoms & 234 L inks & 3 Orbitals & 1 Short l ink remover tool) Package List list: Types: 4(Optional) 1# 122PCS Molecular Model Kit Set((59 Atoms Model+62 L ink Keys+ 1 T ool) 2# 179PCS Molecular Model Kit Set(76 Atoms Model+102 L ink Keys+ 1 T ool) 3# 240PCS Molecular Model Kit Set(86 Atoms Model+153 L ink Keys+ 1 T ool) 4# 444PCS Molecular Model Kit Set(196 Atoms & 234 L inks & 3 Orbitals & 1 Short l ink remover tool)