This shape is specially designed to fit CD's and DVD's. It is very easy to apply without special tools or templates. Simply peel the label off the matrix, hold above the CD and place carefully, pressing air bubbles out gently.
The illustration below is not at actual size, but it shows you how this item compares in size to a credit card.
If you are not sure this size will fit your container, draw the shape on a piece of
paper using a ruler to measure, cut it out and lay it on your container.