Twin pack replacement Yamaha YFM90 ATV, sold under the name Raptor 90, replacing p/n 43D-E4451-00-00. 2 per kit as the YFM90 air box uses 2 identical filters in the airbox. Made in USA. It is shipped un-oiled; add ~2 caps of oil to the filter and squeeze/work it for a minute in the supplied plastic bag, then install.