This apparatus set conforms to the 1994 Sixth Edition. The Class apparatus set recommended for 30 students has 6 additional spectroscopes, 6 additional black boxes including rods, washers, and rubber bands, and 2 additional dice sets. 1 Cloud Chamber Set (64712) 1 Molecular Size and Mass Set (64735) 1 Spectral Analysis Set (64799 or 64799-30 ) 1 Black Box Set (64796-30 ) 1 Dice Sets (Pkg. of 12) (64724) 1 Portable Geiger Counter (64331-00 ) 1 Charger, 1A6/12 Volts (45710-00 )