1)、Function
1. Clutch: Reduction Ratio 1:1.55;Fit with 4.8*6 chain and 38mm tube
2. End Plug: Rotary rebound type, easy to install
3. Bracket: 1.8mm Bracket 
4. Max Load: 5 KG
5. Max Area: 8 square meters
6. Life span: > 5,000 cycles

2)、Material Specialty
1. The shell use high quality engineer plastic materials POM, PC, ABS
2. The body of the clutch: use metal core
3. Bracket with A3 steel plate