The Flanders hammock roll is made of continuous filament spun glass media and is available in the standard depths of 1 inch or 2 inch its glass fibers do not promote the growth of microbial bacteria. This filter is available in a length of 20 feet and in various widths. Hammock rolls are easily cut with scissors or a utility knife to fit any size furnace. The hammock roll is packaged in a sturdy carton that doubles as a convenient dispenser.