Pololu - 0.100" (2.54 mm) Breakaway Male Header: 1×40-Pin, Straight, Black
Header & Socket | Amtek Technology Co.,Ltd.
24 Pin ATX Power Male Header Connector Straight Black - modDIY.com
Amazon.com: Chanzon Round Pin Header Strip for Arduino Gpio 4 pin x 50pcs Male Headers Pins Straight Single Row Gold Plated Pitch 2.54mm 0.1 inch Breakaway for PCB Connector Raspberry pi Machine