Feature:

wire length: 20mm
Wire with 1p-1p pin connector, 2.54mm pitch size
40 pcs means 1 pcs cables which show in the picture (The cable in the picture is with 40 1p-1p wires). Total is 1*40= 40 1p-1p wires.
Package Include:

40pcs 20cm Dupont Wire Cable 1p-1p Male to Female Connector 2.54mm