In one sentence, describe what the following article is about:

In order to create a cardboard loom, you will need:  A piece of cardboard, cardstock, bookboard, or mounting board. A ruler Craft knife Scissors Decide how large you would like to make your loom. The width must be an odd number of centimeters. Cut a piece of cardboard, cardstock, bookboard, or mounting board 2 cm wider than your chosen width and 1 cm longer than your chosen length. Draw a line widthwise across the top and bottom of the loom. The lines should be ½ cm from the respective ends. Mark each cm with a pencil. Cut ½ cm slits at each mark.

Summary:
Gather your materials. Cut your loom. Make slits.