Onwon 6 Pcs 170 Points Mini Solderless Prototype Breadboard for Arduino Proto Shield 170 tie-points total: 2 columns of 17 lanes with two 5 point rows each column.Each row and columns has corresponding letters and numbers. Self-adhesive back tape makes it easy to stick on a platform, such as the Arduino prototype shield. With tight plug-in contacts, the components will sit well after assembly therefore there are no wobbles. The solderless breadboards do not require soldering, therefore they are completely re-usable. This makes it easy to use for creating temporary prototypes and experimenting with circuit design which is a construction base for prototype of electronics. Jumper wires are easy to insert into or remove from these breadboards. With nubbins and slots on the sides to easily connect multiple Solderless breadboard is convenient for the prototypes and circuit design experiment and other DIY projects.