The Devon Negative Pressure Wound Therapy Silicone Gel Strip is an amazing tool to use for ensuring a good seal during the application of gauze or foam wound dressings. They come in a package of seven strips. Each strip measures 3/8 x 4-5/8 inches. The strips consist of a squishy, sticky substance that is very moldable. When applied in successive, overlapping strips in a manner which encircles the wound bed, they almost embed into the film dressing providing an excellent seal. We highly recommend these for any situation in which you are having problems obtaining a good seal.