PRODUCT DETAILS "Cowbell" A simple device useful for counting and among the first calculating devices ever used consists of a wooden board mounted base, over which ‘U’ shaped brass wires are mounted so that the arms of wires are on each side of board. Each wire has 20 beads (10 each of two colour), which assists in counting and calculations. Available in different configurations (number of rows of brass wire) 4 Rows.

PRODUCT DETAILS "Cowbell" A simple device useful for counting and among the first calculating devices ever used consists of a wooden board mounted base, over which ‘U’ shaped brass wires are mounted so that the arms of wires are on each side of board. Each wire has 20 beads (10 each of two colour), which assists in counting and calculations. Available in different configurations (number of rows of brass wire) 4 Rows.