CNC machined aluminum wheel hub anodized. 
Very light weight and versatile design. 
2.75" wheels have rubber layer sandwiched between light foam to maintain its shape under load. 
Very Cool Big 8 Spoke Rim.
Rim Material: Aluminum
Colour: Brushed Silver or Titanium color 
Outer Diameter: 70mm/2.75"
Rim Diameter: 54mm/2.12"
Width: 18mm/0.7"
Weight: 29g/piece
Including two bushings internal diameter: 4mm, suitable for 4mm wheel axle.
 
Note: Titanium color is out of stock in US warehouse