ITEM NAME:10pcs Single Row 40P 40 Pin 2.54mm Female Header Connector Socket For Arduino LJ 10pcs Single Row 40P 40 Pin 2.54mm Female Header Connector Socket For Arduino LJ a.imagelink a:hover.imagelink {color:#5B804D;.Gender of Connector: Female. Pitch 2.54mm. Type of connector: Straight. Type of Row: Single-Row. Number of Pins: 40 Pin.