Features: Jumper wires are easy to insert into or remove from these breadboards. The solderless breadboards do not require soldering, they are completely re-usable, Convenient for the prototypes and circuit design experiment and other DIY projects. Include one 40-pin male to female jumper wires, one 40-pin male to male jumper wires, one 40-pin female to female jumper wires. The cables can be separated to form an assembly containing the number of wires you Require for your connection and to support non-standard odd-spaced headers. Premium copper wire enables those wires with features of good electrical conductivity, low density, and corrosion-proof, easy and safe to use. Product specifications: breadboard: Terminal Strip, Tie-points = 640 Distribution strips, Tie-points = 200 Total Tie-points = 840 8 bus of 25 connected Terminals 4 power segment 2 general segment Dimensions = (175 X 67 X 8 mm) 128 Group of 5 Connected Terminals Can modify or revise the circuits easily Jumper: Length: 20cm Color: multicolor Material: copper wire Quantity: 1 x Breadboard A total of 120 copper wires 40-pin male to female jumper wires 40-pin male-to-male jumper wires 40-pin female-to-female jumpers.