[Acrylic Construction]: Crafted from Acrylic [Versatile Installation ]: Use the self-adhesive for smooth walls like glass [Multipurpose Use]: Ideal for organizing more than just baseball caps, this versatile holder can be mounted behind doors or on bedroom walls to store keys, handbags, and other small items, helping to keep your space tidy and well-organized. [Capacious Design]: Each rack can hold between 10 hats, whether installed vertically or horizontally. This design not only neatly organizes your caps but also maximizes space, making it perfect for small areas.