Material: N/A Assembled Product Length: 120" Assembled Product Height: 4" Assembled Product Width: 4" Diameter: 4" . This thick glass fiber blanket is held together by a virtually impermeable, fire retardant polyethylene jacket It can be easily pulled over existing ducting to reduce heat loss and condensation build up This results in energy savings for your customers They are conveniently rolled in 10 foot lengths for easy shipping and handling