Special Shoot-Thru Polyfoam which is semi-self sealing allowing the backer to last for several thousands of rounds. Very Lightweight, Less than 5 lbs. No Need for Metal Frame due to rigid Polyfoam. 100% WATERPROOF. Dimensions = 24" X 48" X 3". Can be used with all firearms of any caliber. Can be used in permanent installations as well as our portable units. Can be used for tactical barricades. Polyfoam target fasteners replace the need for staples, staple gun, tape, etc. Foam can be ordered in human silhouette for dressing as realistic target.