●Pitch: 2.54mm, Number of pins: 40pin. The pin headers are single row. ●They are very suitable for circuit boards in electronics, electrical devices, measuring devices etc., widely used in computer and breadboard, suitable for Arduino, Raspberry Pi and other electronic projects. ●They are good components for PCB, durable material, suitable for circuit boards in electronics, electrical appliances, measuring instruments, etc. ●Box contents: 10 male and 10 female 40 pin header ●Warranty: Our products have 2 years warranty. Please email us first if you have any questions, we are happy to assist you.