Arduino quality mini bread board has 170 jack, this mini bread board can be used with different types of Arduino ProtoShield (prototype expansion board), with double-sided adhesive, can be pasted in a variety of development board Expansion board can still be affixed to the wheeled robots or robot crawler substrate personalized debugging function, compact only, 45mm 35mm (1.8"x1.4") size, is the Arduino interactive media enthusiasts, robot enthusiasts, electronics enthusiasts and Electronics essential engineers supplies. Items price includes shipping fee that should be borne by the buyer.