840Pcs Flexible Jumper Solderless Breadboard Pin Expansion Wire Kit Electronic Component Item Type: Flexible Jumper Material: Aluminum + Copper Jumper Wire Length: 2mm, 5mm, 7mm, 10mm, 12mm, 15mm, 17mm, 20mm, 22mm, 25mm, 50mm, 75mm, 100mm, 125mm Application: Computers, electronic communications, instruments, meters, industrial program control, digital cameras, MP3, card readers, DVDs, LCM/LCD displays, electronic toys, PCB engineering, PC motherboards, etc. Purpose: Widely used in the connection of electronic projects. It can be used to expand the pins of the experiment board and increase the experiment items. It can be connected to the pins very firmly without soldering, and is used for fast circuit testing.