The first number in the size (example 18" in 18x36) is the roll width and the second number is the roll length. Purchase a quantity of "2" you'll get a piece 72" long, if you purchase "3" you'll get 108" etc. Also, for proper orientation (particularly on Fender installations) the first number will be cabinet height, and the second number will be the cabinet width. This will keep the pattern oriented correctly.
