1.       independent three legs suspended instruction can avoid shock caused by unbalanced loaded.

2.       the roller is made of good quality stainless steel ,strong and durable.

3.       apply the brake good ,safe and reliable performance.

4.       adopt a sticky tape of trigonometry of transmission ,it tis driven the wheel by the electrical machinery to start .walk unhurriedly and start to the nomal rotational speed.Turing round has no vibration steadily.