木製珠算盤 可能黃花梨 The wooden abacus is of rectangular form, consists of standard thirteen columns of compressed wooden beads, each column with two beads on top and five beads on the bottom, retains natural wooden color and grain. The wood is possibly huanghuali wood. Length: 12 13/16 in (32.5 cm) Width: 6 11/16 in (17.0 cm)