The Global Specialties PB-242T Externally powered transparent protoboards offers students of electronics an economical choice for breadboarding without sacrificing quality. The PB242T comes with transparent ABS plastic sockets with phosphor-bronze contacts are mounted on a Metal back plates for added durability. The PB-242T also has 3 terminal strips with 1,890 tie points and 5 distribution strips with 500 tie points, for a combined total of 2,390 tie points. The transparent ABS plastic sockets are perfect for educational applications because they allow student and designers to clearly view circuit connections. Plastic feet and color-coded binding posts are included. Global's PB 242T is ideal to use for designing test fixtures, performing lab experiments and in all areas of custom electronic design applications.