The Global Specialties UBS-100 Solderless Breadboard offers multiple bus strips and a large socket area with 840 tie-points. A permanent molded-in tie-point numbering system allows the user to see at a glance where to tie wires and add connections. Each socket is made of durable high impact plastic and nickel plated phosphor bronze contacts for the highest quality circuit connections. The UBS-100 comes with a heavy-duty Mylar backing to prevent short circuits.