We've combined the best features of free weight exercises with dumbbells, kettlebells, medicine balls, slam balls and sand bag training into one simple yet powerful weight training tool. Improve grip strength and coordination for sure-handed catches and stronger tackling. Great for team and individual drills to work on hand-eye coordination, grip, explosion, core strength. Easy storage makes the Combat Sand Bells perfect for at home use as well. Now you can get a dynamic free weight exercise without an expensive gym membership.