Orbit-Colour Wave-Model-Kits-Cochranes-Of-Oxford-1283-Buy-Orbit-Atom-Model-Kit-Iron-from-Cochranes-of-Oxford-allows-students-to-build-models-that-contain-sufficient-atoms-to-see-the-relationships-between-the-structure-&-physical-properties-of-a-range-of-materials-The-bonds-are-colour-coded-to-distinguish-between-covalent-ionic-Van-der-Waals-&-hydrogen-bonding-Orbit-Colourwave-Model-Kits-are-easy-to-build-low-cost-&-make-excellent-teaching-&-display-models-Students-lear