The Global Specialties economically-priced transparent ABS solderless breadboarding sockets connect easily by way of molded key tabs to other economy line breadboarding sockets, or bus strips. The transparent ABS plastic sockets are perfect for educational applications because they allow student and designers to clearly view circuit connections. Most economy line sockets come with colored numbers, allowing for convenient and easy viewing of circuit connections. Global' solderless breadboards can be used to experiment and design a multitude of analog and digital circuits, as well as test fixture and prototyping applications. Sockets are made of ABS plastic and phosphor-bronze contacts. Read Less...