Universal compatibility with a range of marker models, including 8101, 8102, 8106, 8201, and 7100, providing a for an optimal writing experience. High-quality nylon fiber construction ensures stable ink and long-lasting performance, designed to withstand frequent use without wearing out or deforming. Compact size of approximately 1.7*0.4 cm allows for precise control and a comfortable grip, making them suitable for fine work and projects.