No wobble. The components will sit well after assembly due to tight plug-in contacts. The solderless breadboards do not require soldering, therefore they are completely re-usable. ABS plastic body with black printed legend. color legend on distribution strips. The components will sit well after assembly due to tight plug-in contacts. Self-adhesive tape on the back, make it easy to stick on the prototype shield.each row and columns has corresponding letters and numbers, reduce the mistake handling. Convenient for the prototypes and circuit design experiment and other DIY projects. Perfect for Arduino, Raspberry Pi, and other programming boards. 2 x 830 point + 2 x 400 point Solderless Breadboards (630 tie-point ic-circuit area plus 2x100 tie-point distribution strips providing 4 power rails) You can extend with as many other boards just by fitting the extension clips. Made of durable ABS plastic .