Seifer is glass made by bonding multiple sheets of glass with a special resin interlayer. Because the interlayer and glass are strongly bonded, even when the glass breaks under strong impact, fragments are less likely to fall out. This provides excellent penetration resistance, and even when the glass is broken, it rarely creates an opening, providing security benefits. Additionally, the interlayer blocks over 99% of UV rays, preventing deterioration of furniture and other items indoors.