Serpent 747 aluminium pullies
Serpent have released these aluminium pullies for their 747. Machined from aluminium and then PTFE hard-coated with a precision tooth profile with pressed on super lightweight anodized side covers with small holes to allow dirt to fall out. They are available for the entire car in 35T, 40T, 21T, 18T, 21T & 20T versions.
Source: Serpent [serpent.com]