Which of the following materials is known for being lightweight and having a low resistance to abrasion/dents?

Carbon fiber is known for being exceptionally lightweight while also exhibiting remarkable strength-to-weight ratios, making it a popular choice in various applications, including watchmaking. Its structure consists of tightly woven strands of carbon atoms, leading to enhanced stiffness and a very low density, which results in a lightweight material. However, despite its strength, it can have a lower resistance to abrasion and dents compared to some metals and ceramics, making it more susceptible to surface damage under certain conditions. This characteristic is crucial for applications where lightweight construction is prioritized, but the risk of minor surface impacts must also be considered. Other materials like aluminum provide some toughness against dents but may not offer the same level of weight reduction as carbon fiber does.