Sealing Rings
Shower sealing rings are typically made of silicone rubber or fluororubber. Silicone rubber is inexpensive but less durable. Fluororubber is more costly but offers superior resistance to high temperatures, corrosion, and aging.
Screws and Fasteners
Shower screws and fasteners are usually made of stainless steel or copper. Stainless steel is more expensive but corrosion-resistant. Copper is less expensive but prone to rusting.
Different materials have distinct advantages and disadvantages; manufacturers must make their choices based on their specific needs and budgets.