The Global Specialties GS-830 Solderless Breadboard with Bus Strip, 830 Tie-Points breadboard connects easily by way of molded key tabs to other GS Series breadboards or bus strips. This breadboard comes with red and blue lines indicating continuity and allow for convenient and easy viewing of circuit connections. Use bus strips for signal and power connections in breadboarding experiments and circuit design. The GS-830 is made of ABS plastic with phosphor bronze contacts.