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Direct from manufacturer. Made in the USA.

Filter material: 100% monofilament polyester with water repellent finish standard on all pre-filters.
Closed top, round taper pre-filter.
Measurements: 3.0"T, 3.75"B, 5.0"H

Compare to K&N SN-2520PK 
Fits K&N Air Filters: RC-4340, SN-2520