It is an essential gap tape when raising the super lightweight door to the sound insulation performance exceeding the super weight class soundproof door or raising the normal aluminum sash to the sound insulation performance several times higher than the sound insulation sash. It is expensive as a gap tape but it is worth it. Manufacturers are also considering to manufacture with high precision and to deliver the shape of the long form. However, it has been folded and packed from a monotail. This will not be usable.