Beautiful Glass Blocks: Japanese Electric Glass Blocks Affordable Price, 7.5 x 7.5 x 3.7 inches (190 x 190 x 95 mm), Japanese Standard Size, Clear Color, Non-See-Through Type, 4 Side Groove Processing, Vibration Resistant, Flat Surface, Easy to Clean, For Use with High-rise Buildings, Exterior, Interior, Outdoor, Indoors; Manufacturer: Japan Electric Glass; Country of Origin: USA, Thermal Insulation, Safe Indoor or outdoor Versatile glass blocks that can be used for a variety of purposes. For new construction renovations, it can be used for a variety of purposes such as garden walls, sash windows, gate pillars, entryways, fixtures, partitions, exterior walls, floors, ceilings, windows, partitions, etc. Note: Glass blocks for building materials may have internal scratches and streaks, air bubbles, internal crystals, and stains. This product is inevitable from the production process, so it is not a defective product.