When sourcing shower mixers, the material is the most critical factor for longevity. Solid Brass (H59/H62) is the industry gold standard due to its excellent corrosion resistance and antimicrobial properties. For budget-conscious projects, 304 Stainless Steel is a durable, lead-free alternative. Avoid zinc alloy bodies for internal water-carrying components as they prone to pitting and leaks over time. Ensure the cartridge is made of high-quality Ceramic, which should be tested for at least 500,000 switching cycles to prevent dripping.