Air Filter / Stihl 4229 120 1800Pack Size:1Stihl 4229 120 1800J. Thomas 100739, Rotary 14258Stihl BG45, BG46, BG55, BG65, BR45, SH55 and SH85Width: 2 3/8 ", Length: 3 ", Height: 1/2 ", Woven fabric; one piece air filter and pre filter