Serpent 733 5mm rear belts
Serpent have released new optional rear belts for their 733 200mm chassis. The first, an orange version of the standard kevlar reinforced belt, comes in 5mm (wide) making it more durable than the 4mm kit version, while sacrificing some drag. Serpent have also released a low friction Pro version of this new belt, which again is stronger than the standard 4mm belt but allows for a smoother drivetrain, eliminating most of the drag caused by having the extra width.
Source: Serpent [serpent.com]