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: 5.13"T, 7.72"B, 8.5"H
Fits Spectre Air Filters: HPR0891, HPR9891
Also direct fit for AEM 21-2100DK (AEM 1-4003 Filter Wrap)