Note: the breadboard wire is a little soft so that convenient for changing its shape to do connect test; if you find that it can't be inserted, please check whether the cable in the pin hole of the breadboard is in good condition or not. Easy to use:all the colored jumper wire are pre-stripped and preformed right-angled, easy to insert it into breadboard. Wide applications:designed to work well with any breadboards or anywhere jumper wires are needed, perfect for breadboard projects. Each box contains:560 wires with 14 different lengths. 2mm, 5mm, 7mm, 10mm, 12mm, 15mm, 17mm, 20mm, 22mm, 25mm, 50mm, 75mm, 100mm, 125mm, 40 pieces of each. Color: Random color (Red, Orange, Yellow, Green, Blue, Purple, Coffee, White).