The Global Specialties GS-400 Solderless Breadboard with Bus Strip, 400 Tie-points connects easily by way of molded key tabs to other GS Series bus strips, or breadboards. Most breadboards come with red and blue lines indicating continuity and allow for convenient and easy viewing of circuit connections. Use the GS-400 for signal and power connections in breadboarding experiments and circuit design. This strip is made of ABS plastic with phosphor bronze contacts.