Features: Material: Made of sponge, they are practical and safe for human. Application: The filter cotton is used in the nasal suction device to filter nasal mucus and impurities, etc. Easy Operate: It is easy to operate, simply replace your old filter with new ones. Universal: Can be used with a variety of nasal suction devices. Quantity: 1pack has about 100pcs filters, can meet your daily need. Specifications: Item type: Nasal aspirator filter Material: Sponge Color: Random color Size: About 12 x 10mm/0.47 x 0.39inch(diameter x thickness) Package includes: Mechanical bidet 100pcs/pack x Nasal aspirator filters Notes:  Transition: 1cm=10mm=0.39inch  1. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you!  2. Please allow 1-3cm measuring deviation due to manual measurement.