They are made of painted steel or aluminum sandwich panels with a Styrofoam filling on the inside to provide the utmost degree of thermal and acoustic insulation. Special EPDM seals and nylon brushes along the closing edges guarantee a perfect degree of sealing. The slides are composed of high-resistance steel ball bearings that make opening and closing light and easy. The locks are of the double-closing, chime type with tropicalized steel guides and slamming stiles.
