The most common high-quality materials are Melamine, Acrylic, and Urea-formaldehyde resin. For premium or professional markets, prioritize Melamine because it offers a superior hand-feel, high density, and excellent resistance to scratching and fading. Ensure the tiles have a uniform weight (typically 15g-30g per tile depending on size) to ensure a professional gaming experience. If sourcing eco-friendly options, verify if the manufacturer uses recycled plastics or sustainable wood for the storage cases.