1. Single-sided flexible PCBs: These PCBs have a single conductive layer on one side of the flexible substrate.

2. Double-sided flexible PCBs: These PCBs have conductive layers on both sides of the flexible substrate.

3. Multilayer flexible PCBs: These PCBs have multiple conductive layers separated by insulating layers. They are used in complex electronic devices.

4. Rigid-flex PCBs: These PCBs combine the flexibility of flexible PCBs with the rigidity of traditional PCBs. They have both flexible and rigid sections.

5. Sculptured flexible PCBs: These PCBs have a three-dimensional shape and are used in applications where space is limited.

6. Adhesiveless flexible PCBs: These PCBs do not use any adhesive to bond the layers together. They are more environmentally friendly and have better thermal performance.