Convenient Workout, Easy to Take Anywhere - Exercising with AB inline skates does not require hours of learning. This caster is light, space-saving and easy to carry _x000D_ Two parallel and silent wheels - The spacing between the two wheels is 3 cm: the force can be distributed evenly. During training, the wheels do not tilt to the side. They don't make noise: Your motivation for training_x000D_ will not be affected by unpleasant noise _x000D_ Comfortable Knee Pad - High quality foam pad will protect your knees. It can also be used as a seat mat _x000D_ Non-slip grips - The thick foam grips can absorb perspiration: this allows you to extend the workout time _x000D_ Training area not required, no scratching the floor - You can workout anywhere without the risk of scratching the floor, for example, in the home, office, gym, etc