The material consists of a presentation tray containing six colored boxes of bead material:
-one box containing 5 sets of colored bead stairs
-one box containing 5 sets of negative bead stairs
-one box containing 1 black and white bead stair
-one box containing 1 pink and white bead stair
-one box containing 23 golden ten bars
-one box containing 23 gray ten bars.
This material is used to introduce the concept of negative numbers.
