||16 complementary blocks, covering charges up to +/-3
||$40.00||*All systems comprise an extensive chart of common ions.
Prices do not include shipping and handling. There is, however, a 5% discount for orders larger than 10 systems
||28 complementary blocks, covering charges up to +/-4, for more extensive coverage of the ionic compounds, and a four-sided spinning top
||Same types of blocks as Basic, but larger blocks, for better visibility in large classrooms