The LINE2design Chest Seal is an advanced occlusive dressing designed to treat open chest trauma.?The Chest Seal is used when there are penetrating injuries to the chest that result in open chest wounds that may lead to traumatic tension pneumothorax. Used by Military, Police, Fire, EMS and First Responders. Large square 5.75" x 5.75" for maximum coverage area. Large pull tab for easy peel and application. Transparent backing for easy placement over the traumatic chest wound. Strong medical grade hydrogel adhesive for superior bond. Conforms and adheres to all body surfaces. Sterile. Latex-free. Non-vented. Easy to open vacuum sealed package. Individually packaged. FDA 510(k) Exempt.