The Orbit 6 pronged octahedral grey atom represents metal. It is used to represent sodium in the sodium chloride structure model and titanium in the rutile model and is also included in the Class Crystal Structure Models Set.
Indigo Instruments has held inventory of genuine Cochranes of Oxford atoms & bonds for over 30 years (scroll down to see "Skeletal (Orbit/Minit)". These parts are 100% compatible with every set & kit we've ever sold. Why buy from others where support could end the day after?
You can use these Genuine Cochranes of Oxford Orbit Molecular Model Parts to replace missing pieces or augment any of the Orbit Molecular Model Sets & Molecular Model Kits supplied by Indigo Instruments.