3 Layers: 
CNC treatment,
For boot EUR#35-45(US#3-13)
EUR#35-37:Wheels 76/76/76/76x24mm
EUR#38-45:Wheels 80/80/80/80x24mm

H Type:
Pressed+CNC treatment,
For boot EUR#33-47(US#1-15)
EUR#33-35:Wheels 72/72/72/72x24mm
EUR#36-39:Wheels 76/76/76/76x24mm
EUR#40-47:Wheels 80/80/80/80x24mm

2 PCS
For boot EUR#33-47(US#1-15)
EUR#33-35:Wheels 72/72/72/72x24mm
EUR#36-39:Wheels 76/76/76/76x24mm
EUR#40-47:Wheels 80/80/80/80x24mm