1 Layer PCB Flexible Board 1oz 0.8mm PCB Solder Mask Yellow Cover Film

1-Layer Flex PCB Solder Mask Yellow Cover Film 0.8mm No Silkscreen

Flex PCBs are typically made of polyimide or polyester materials that are sandwiched between thin layers of copper. This allows them to bend and twist without breaking the electrical connections. They are also much lighter and smaller than rigid PCBs, which makes them ideal for applications where weight and size are critical.