Premium Material: High-quality cotton filter, non-woven material. Helps provide respiratory protection. Maximum Safety: The filter cotton can block almost all airborne particles, providing you with maximum safety. Comfort: The respiratory protection filter is lightweight and has low breathing resistance, ensuring comfortable wearing and long-lasting working comfort, providing you with a better working environment. Compatibility: Commonly used for 501 filter element holder and 6001, 6002, 6003, 6004 and other filter elements. Suitable for 3M 6200/7502/6800 series ink cartridges. Package Contents: 80 pieces per pack, includes 80 5N11 cotton filters. It measures approximately 10.5 cm high, 5.5 cm wide at the top and 8.5 cm wide at the bottom.