Made of solid cast iron with a 2-inch center hole fits any Olympic bar with diameter 2”; Can be used with 2” dumbbell bars too. All plates features a durable, baked enamel finish to prevent the plates from rust and corrosion without any unpleasant odor. Material and Compatibility: Crafted from durable solid cast iron, these weight plates feature a 2-inch center hole, making them compatible with both Olympic bars and 5-inch dumbbell bars. Protective Finish: Each plate is coated with a high-quality gray baked enamel finish, ensuring long-lasting protection against rust and corrosion, all while being free from any unpleasant odors. User-Friendly Design: Designed with convenience in mind, the plates include three large openings with textured strips for a secure grip, and are clearly labeled in both pounds (lb) and kilograms (kg) for easy identification. Versatile Use: Ideal for a variety of fitness routines, these weight plates can be used to enhance muscle strength, improve endurance, and boost flexibility and balance. Multiple Weight Options: Available in a range of weights, these plates cater to different fitness levels and training needs, providing flexibility for your workout regimen.