The material of a Timing Belt typically consists of several components:
1. Rear rubber: Chloroprene rubber
2. Tooth Rubber: Chloroprene rubber
3. Core wire: Glass Fiber
4. Backing cloth (Tooth Fabric): Nylon canvas
Additionally, some timing belts are made from Rubber and others from Polyurethane. The tooth rubber often adopts chloroprene to protect the core wire from dirt, grease, and wet environments.