1. COMPATIBILITY: Wide application for FX651V, FX730V, FX801V, FD731V, FD750D, FD791D, FH601V, FH641V, FH680V, FH721V, FH770D, FH601D, FH641D, FH680D, FH721D; fits for C940-C980, CH18-CH1000, CV16-CV1000, LH630-LH775, LV625-LV680 16-26 engines. 2. Outer Air Filter Replace for: 25 083 01, 25 083 01-S; Replace for: 11013-7020, 11013-7044; Replace Part Number: P821575, M131802, M144100, M164264, M170281 & MIU12457, AF25551. 3. Inner Air Filter Replace for: 25 083 04, 25 083 04-S; Replace for: 11013-7019, 11013-7045; Replace Part Number: P822858, M131803, M144098, AF25552. 4. FILTRATION EFFICIENCY: Designed for low flow resistance, this air filter is composed of high-density, multi-fiber medium. With a dirt keeping capacity, it collects 99% of airborne particles effectively. 5. Color: As Shown. 6. Material: plastic. 7. Package Contents: 2 x outer air filter, 2 x inner air filter, 1 x filter. Only the above package content, other products are not included. 8. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.