The Global Specialties GS770 770 Tie-Point Breadboard with Bus Strip connects easily by way of molded key tabs to other GS Series breadboards or bus strips. Most breadboards come 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-770 is made of high impact ABS plastic with phosphor bronze contacts.