SI Manufacturing Teacher Demo NFM 10-Bar with Colour ChangeLarge wooden counting frame features 100 plastic beads in red and white on 10 rails (colour change after 5 beads). The upper 5 bars have 5 red beads on the left and the lowest 5 bars have white beads on the left. This reinforces that 100 is composed of two sets of 50. Useful to demonstrate addition and subtraction up to 100. 20"L x 16 1 3"H.