Was given two of the Competition Style Kettlebells as a Christmas gift. The 16kg bell was fine but the 12kg bell has a very unstable bottom that wobbles badly and presents a safety hazard when doing pushups on the bell. In their own description Titan says that the bottoms are flat and stable for pushups. Product Overview The Competition Kettlebells are designed to improve overall strength, burn calories, and improve performance. Ranging from 8 KG (18-pounds) up to 40 KG (88-pounds), these single, solid piece casts are made of steel and retain the same machined body allowing you to train the same movement while also increasing or decreasing weight to cater to your routine. They are constructed with a durable, smooth wide-loop handle, a round profile with laser-engraved weight indications in KG, and a flat base that allows for push-ups and no wobbling. These kettlebells are ideal for building muscles, enhancing core strength, and improving balance. Additionally, they work as weight resistance and counterbalance for various upper and lower-body exercises. I notified warranty and they said, "Hello. Thanks for responding. In this case I'm afraid we cannot proceed with the warranty as that is not an intended use for the kettlebell. They weren't designed for that and we will not replace something for not being able to do what it wasn't supposed to. We apologize for any inconvenience. Have a good day. Ralph Titan Fitness Support"