The Pro-Tec Athletics High Density Foam Rollers are perfect for gym and training workouts. These black rollers are 4 inches in diameter and 12 inches in length, making them ideal for travel or on-the-go use. With a weight of 0.18 pounds, they are lightweight and easy to handle for various fitness activities like yoga or running. The durable high-density foam provides comfort and support for your muscles during your workout routine.