Durable weather resistant all rubber medicine balls. The synthetic rubber shell and hollow construction of these balls allow them to bounce. Textured surface for improved grip. Throw them against the walls, off the floor, indoors and out - they are very durable. Available in five different weights. Premium Med Ball 4 lbs. Heavy duty weighted ball that bounces. Durably built to bounce off hard surfaces. Improve coordination and endurance. Easy-to-handle size. Great for indoor and outdoor training drills. Color: Red/black. Size: 4 lbs.