Description: The breadboard is specially designed for non-welding experiments of electronic circuit. Because various electronic components can be insert or pull out freely as needed without welding, it can save circuit assembly time, and components can be reused, which is suitable for electronic circuit assembly, testing and training. Features: Whole board is made of thermosetting phenolic resin, with metal strip at the bottom, and holes at the corresponding position make the element contact with the metal bar so as to achieve conductive purpose. Reusable for fast build a prototype of an electronic circuit. Can modify or revise the circuits easily, no soldering required. Similar prototyping printed circuit boards. Each unit will accept transistors, diodes, LEDs, resistors, capacitors and virtually all types of components 4*700 solderless points. Specifications: Model: SYB-500 Type: 4 in 1 (4*700 points) Length: 24cm/9.4in Width: 20cm/7.9in Height: 2.8cm/1.1in Weight: 458g(approx.) Package Includes: 1 x Breadboard 1、Whole board is made of thermosetting phenolic resin, with metal strip at the bottom, and holes at the corresponding position make the element contact with the metal bar so as to achieve conductive purpose. 2、 Reusable for fast build a prototype of an electronic circuit. 3、 Can modify or revise the circuits easily, no soldering required. 4、Similar prototyping printed circuit boards. 5、 Each unit will accept transistors, diodes, LEDs, resistors, capacitors and virtually all types of components 4*700 solderless points.