These pleasingly clickable tactile switches are available in three sizes and will come in useful in loads of electronic projects.
Momentary switches complete the circuit whenever the button is pressed down. They're ideal for soldering onto PCBs, protoboard or breakouts, but it's also possible to use them with solderless breadboards if you flatten out the legs!
We also sell an assortment of these switches in our Maker Essentials kit (along with some colourful 12mm switch caps and some handy potentiometers).