1. The outer diameter is 710mm and the inner diameter is 440mm and the thickness is 110mm

2. Buoyancy: ≧ 14.5kg (suitable for people weighing 450kg)

3, material: shell is high density polystyrene 売 body; The inner core is filled with high density polyurethane closed-cell foam plastic with stable color, anti-aging, corrosion resistance and stress resistance.

4. Weight: 2.5KG