It is a kind of carbon fiber twine, can be 3 twists or 4 twists. It's diameter is 3mm, 4mm, 5mm, 6mm, 8mm, 10mm, till 25mm. Carbon Fiber ThreadIt is a kind of carbon fiber twine, can be 3 twists or 4 twists. It's diameter is 3mm, 4mm, 5mm, 6mm, 8mm, 10mm, till 25mm. This kind of thread is suitable for special condition. Carbon Fiber Thread