BB400 Solderless Plug-In BreadBoard plus SB404 Solderable PC BreadBoard, 400 connection points, with matching breadboard pattern Test your circuit on the BB400. Move your parts to the SB404 to make it permanent. Both boards have the same 400 connection point pattern and power rails. The SB404 solderable PC BreadBoard has two bonus power rails, more bonus pads down the centreline, and mounting holes. BreadBoard has White ABS plastic body with black printed legend and contacts are phosphor bronze with plated nickel finish. Rated for 50,000 insertions and 36 Volts, 2 Amps. Metal backing plate included. PCB is a single-sided high-quality FR4 glass-epoxy circuit board, 1oz/ft2 copper with an anti-tarnish coating for easy soldering. Total of 628 0.042in holes, drilled on 0.1in (2.54mm) centers. Four mounting holes. BreadBoard size: 3.3 x 2.1 x 0.3in (84 x 54.3 x 8.5mm). PCB size: 3.75 x 1.85 x 1/16in (95.3 x 47.0 x 1.6mm) Lead free and RoHS compatible.