The filters are made of ultra-fine spinning fiber cotton, effectively filtering fine particles, dust.
Each filter measures 2 1/8" x 1 7/16" to fit your machine precisely.
White filter cotton is recommended to replace 1-2 pieces in 1 month.
Not only help you keep your lungs clean, but also prevent dust, dirt and other substances.
Size: about 2 1/8" x 1 7/16".
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