You will have to look at the picture on their site to make sense of the dimension but the front long side is 6" the rear short side is 2" and the sides are 3". The total thickness is about 1/8".
I have them on my cages but are they necessary, no just help with reducing the vibrations and holding everything together. I personally like the Adjustable Rain Nozzle as it sit on top of the cage and gives a nice spray into the cages. I only have one of these currently but would like to convert all my cages to the Rain Nozzle.