The price of a bathroom shower is primarily determined by material quality, valve technology, and surface finish. High-end models typically use H59/H65 lead-free brass for the main body, which offers superior corrosion resistance compared to cheaper zinc alloy or stainless steel 201. The ceramic cartridge is the heart of the shower; premium brands often use European-made cartridges (e.g., Sedal or Kerox) that are tested for 500,000 to 1,000,000 cycles to prevent leaks. Additionally, the PVD (Physical Vapor Deposition) coating or electroplating thickness (measured in microns) significantly impacts the price, as it ensures the finish remains scratch-resistant and anti-tarnish for over 10 years.