These are two pin jumpers (also called shunts) that will create an electrical connection between two pin headers. Commonly used to modify settings on a board or device. Remember when you had to set an IDE hard drive as 'Master' or 'Slave' on the IDE ribbon? These jumpers were priceless if you sneezed and lost one.it comes in 6 diffrent colors Red,Green,Blue,Black,Yellow, and Grey.