When evaluating shadow boxes, the frame material and glazing are paramount. For the frame, solid wood (pine, oak, or paulownia) offers the best durability and aesthetic appeal, while MDF with wood veneer is a cost-effective alternative for high-volume retail. The glazing should ideally be tempered glass for scratch resistance and clarity, or high-grade acrylic (PMMA) for shatterproof safety and reduced shipping weight. Ensure the internal depth (working space) meets your specific display needs, typically ranging from 0.5 to 3 inches.