hese Premium Jumper Wires Are Good To Wire Harness Or Jumpering Between Headers On PCB'S. These Premium Jumper Wires Are 8" (20cm) Long And Come In A Strip Of 40 Wires With 4 Pieces Of Each Of Ten Colors. They Have 0.1" Male Header Contacts On One End And Female Header On The Other End, And Fit Cleanly Next To Each Other On Standard-Pitch 0.1" (2.54mm) Header. The Wires Come In A 40-Pin Ribbon Cable Which You Can Either Keep Them Together To Neatly Organize, Or Pull The Ribbon Wires Off To Make Individual Jumpers. We Even Have Male To Male And Female To Female Jumper Wires To Complete All Your Jumper Wire Requirements. For Best Results And A Clean Look, Have The Side With The Latch Sticking Out