Day 1 Fitness Medicine Exercise Ball with Dual Texture for Superior Grip – 10 Size Options, 4-20 Pounds – Fitness Balls… $23.96 – $73.98 Make sure this fits by entering your model number. REPLACE HAND WEIGHTS WITH OUR MEDICINE BALL – A superior alternative to free weights, these multipurpose weighted medicine balls provide optimal heaviness for resistance to increase endurance, coordination, muscle strength. ENDURES THE INTENSITY RIGHT ALONG WITH YOU – Made with durable rubber and a strong construction that won’t puncture, the dual grip texture allows for a comfortable secure hold.