TRX Kettlebells are a great addition to your workout -- from squats, swings and snatches, to thrusters and walk carries that build strength and endurance. TRX kettlebells were put through a premium gravity cast moulding process, resulting in ultra-durable kettlebells with a flat bottom, even finish and smooth, comfortable handle for easy gripping and transitions. TRX Kettlebells are sold individually in weights from 4 kg to 40 kg.