FLAT BASE - kettlebells need to be created with a flat base for easy storage and use during floor workouts, kettlebells without flat bases will roll around which makes it hard to store and use during movements like pushups, rows and renegade rows 
GRAVITY CAST - this ensures precise weight, you need to be confident you are training with the correct weights. Kettlebells which are gravity case are more weighted more precisely, kettlebells which are not gravity cast have imperfections in the weight as the mold gets older and cannot be counted on for accurate training 
SMOOTH HANDLES - easy to grip and hold onto but smooth so there is no discomfort in your hands during grueling workouts. Kettlebells with rough handles will chafe your hands and make it hard to complete a workout. 
LIFETIME WARRANTY & FREE WORKOUTS, we publish workouts, techniques and how to's you can access with your purchase designed to enhance your workout experience! REVIEWS - Over 100 Five Star Amazon Seller Reviews and thousands 5 Star Reviews Online! LIFETIME WARRANTY - we carefully craft these kettlebells out of a SINGLE piece of cast iron which creates the most durable kettlebell you can make, because of this we are able to guarantee the structural integrity of this kettlebell for your life!