The Bead Bars for Teen Board with Box (C183) are the color-coded bead bars used alongside the Teen Board to give children a concrete, quantity-based understanding of the numbers 11 through 19 by combining a ten-bar with unit bars. This material serves the early primary math curriculum and is essential for making the composition of teen numbers sensorial and explicit rather than purely symbolic. Having a dedicated, well-organized set ensures smooth lesson flow and reduces time spent sorting from a shared bead cabinet.