Product Details:
Material: Titanium Alloy TC4 (Gr5)   

Weight: 5mm-3g

              10mm-6g

              15mm-7g

              20mm-11g

              25mm-12g

             30mm-16g
 
Outer diameter:31.8mm

Inner diameter:28.6mm

Thickness:1.7mm

Package includes:
 1pcs Titanium Ti Bike Spacer