The Large Bead Frame (C121) is a hierarchical abacus-style material that supports the child's transition from concrete to more abstract four-operation arithmetic, typically introduced in the upper elementary years. It represents units through thousands using color-coded beads on wires and aligns directly with the passage from the stamp game and small bead frame toward abstraction. Teachers working with children who need extended concrete support for multi-digit multiplication or long division will find it a dependable bridge material.