It is one A window blind is type of window covering. There are many different kinds of window blinds which use a variety of control systems. A typical window blind is made up of several long horizontal or vertical slats of various types of hard material, including wood, plastic or metal which are held together by cords that run through the blind slats. Window blinds have varying thermal effects: they can block unwanted heat of the summer sun and they can keep in heat in cold weather. But in both of these applications, they also reduce light to varying degrees, depending on the design.of the flagship brand of ply. It is Moisture Resistant. Moisture Resistant Grade blockboard can withstand some amount of moisture and humidity. This product is of interior grade for indoor use.