The 5 pronged dsp3 trigonal bipyramidal atom is used in models of graphite and graphene which can be rolled up into a nanotube shape.
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?