Abstract: A protective end cap made of a resilient material that is received on the ends of a weight bar. The end cap has a series of annular ribs along its length that have a diameter larger than a through hole in a weight. An elastomeric stretchable weight, like a common wrist weight, can be secured onto the end cap by a user stretching it over the end of the end cap it letting contract between two of the ribs. The greater diameter of the ribs prevent longitudinal movement of the stretchable weight. A rigid weight disc can be secured on the end cap by forcibly pressing the weight disc over the ribs. The weight disc compresses the ribs, allowing the weight disc to pass along the end cap and rest against a flange at the other end. Ribs not compressed by the inner surface of the weight disc return to their original shape and their greater diameter keep the weight from sliding off.