The Small Bead Frame (C120) is the standard lower elementary material for introducing and practicing the four operations through 9,999, serving as a concrete bridge between the large bead frame work and eventual abstraction in arithmetic. The color-coded beads reinforce the hierarchy of units, tens, hundreds, and thousands, allowing children to build equations hierarchically and check their own work. It's an essential shelf material for any 6–9 classroom moving children through the passage from concrete to more representational math.