In 9 major rotary parts adopt ball bearings (BB).
Preservative treatment of aluminium alloy wire wheel.
Long life of the spring.
Wheel shell has a stainless steel side cover.
High strength toughness of the fiber body.
Stainless steel shaft and screw, brass of large gear plate.
Soft rubber coated the comfortable handle.
Folding rocker arm.
Interchangeable rocker arm.
Powerful gear to improve the strength and smoothness.
The double helix wiring system.