It has 12 columns in Materialize grid. It is No matter the size of the web browser and each of these columns will always have the same width.
All columns must be contained within a row and you must add the col class to your internal divs to convert them into columns
S1 is stands for small-1 column on small screens.
M1 is stands for medium-1 column on medium screens.
<div class=”col s1″>1</div>