• Each button is 10mm x 10mm square• Button pads tile up nicely edge to edge but can be cut down nicely if needed•3mm of travel when pressed to give a very satisfying feel• Conductive pad ring which can close a properly designed contact underneath• Perfect for use with the Adafruit Trellis (Maplin Code: A89QN)• We would recommend our super bright LEDs Blue, Yellow, Red & White So squishy! These silicone elastomer keypads are just waiting for your fingers to press them. Go ahead, squish all you like! (They're durable & easy to clean, just wipe with mild soap & water) These are just like the light up rubber buttons you find on stuff like appliances & tools, but these are open source & easy to integrate into your next project. Each button is 10mm x 10mm square & 10mm tall. There is 5mm of grid spacing between the buttons. You can 'tile' the button pads edge-to-edge & they'll grid up correctly. You can also cut the pads down if you like, the silicone is very soft. The way they're molded, they give about 3mm of travel when pressed for a very satisfying feel. They are completely quiet, however. On the bottom of each button is a conductive pad ring which can close a properly design contact underneath. Each button is 10mm tall & can fit a 3mm LED inside quite easily. 5mm LEDs are too big, so stick with 3mm here. The LED is optional, having it or not does not affect the 'action'. but it's nice to backlight buttons.