The Fiend Belmont PC peg features a 6000 series aluminum core with 4mm thick, nylon composite, outer sleeve with large outer diameter to reduce dropout drag. This nylon outer sleeve slides well on all surfaces including aluminum, wood, and concrete. 

4.25" Length
Diameter: 1.57" (40mm)
Length: 4.25" (108mm)

4.5" Length
Diameter: 1.57" (40mm)
Length: 4.48" (114mm)