Cock ring sets are commonly made from a variety of materials, including silicone, metal, rubber, and TPR (thermoplastic rubber). Silicone is soft, flexible, and body-safe, making it ideal for comfort and beginner use. Metal rings offer a firmer, non-stretch fit, providing more intense constriction, which is better suited for advanced users. TPR and rubber rings offer elasticity similar to silicone but are slightly less durable. The best material depends on your personal preferences, but silicone is often recommended for its comfort and ease of use.