The Rogue Fitness OSO barbell Collars in Gunmetal are a high-quality pair of standard collars designed for gym and training purposes. Made of durable aluminum material, these collars are lightweight and perfect for adding stability and protection to your barbell workouts. With the trusted Rogue Fitness brand and a sleek gunmetal color, these collars are a reliable and stylish accessory for any strength training routine. Made in the United States, these collars are a must-have for fitness enthusiasts looking to enhance their workouts.