Sportbell modular, adjustable dumbbells are great for maintaining a healthy lifestlye. The Sportbell system is perfect for all dumbbell exercises, especially with the patented turbo-lock weight change system, you can move quickly from one exercise to another with ease. The ingenious concept with Sportbell is that every weight plate has its own integral locking mechanism . . . with a simple quarter-turn, the weight is changed. This hassle-free system allows you to stay focused on your workout, not looking for another dumbbell or trying to get some complex selectorized system to work correctly. Sportbell . . . The Smart Dumbbell! If you are looking for portable dumbbells, then sportbell is perfect for you. The Sportbell Duffle has a urethane foam insert which has been custom designed to transport Sportbell securely and with style. The personal trainer or physical therapist, on the go, will appreciate the attention to detail and quality that went into this portable dumbbell system.