- Computer calibration ball heart balance, high stability and low noise
- Special durable plastic materials
- Steel shaft is not easy to break
- Ball shell adopts advanced silicone rubber slip ring.
- Used also for relaxing purposes.
- There are 2 types of start: 1. Rope start one, need use rope then can start (this one includes 2 ropes in) 2. Self start (Inside it has a spring can self start after a pull).
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