ETA hand2mind Mini Student Number Balance Beam Classroom Kit (Set of 15) Display number relationships of equal to (=), greater than (&gt;), or less than (&lt;), basic operation skills and more with this self-checking balance Children learn algebraic equations and properties of arithmetic as they manipulate the balance Classroom set includes 15 mini number balances and each balance includes 20 hanging masses with 4 removable plastic compensators Balances measures 4 1/4 Activity guide included