A. COMPATIBILITY: Suitable for FX651V, FX730V, FX801V, FD731V, FD750D, FD791D, FH601V, FH641V, FH680V, FH721V, FH770D, FH601D, FH641D, FH680D, FH721D engines, and applicable to C940-C980, CH18-CH1000, CV16-CV1000, LH630-LH775, LV625-LV680 16-26 engines. B. REPLACEMENT INFORMATION: Outer Air Filter can replace 25 083 01, 25 083 01-S, 11013-7020, 11013-7044, P821575, M131802, M144100, M164264, M170281, MIU12457, AF25551. Inner Air Filter can replace 25 083 04, 25 083 04-S, 11013-7019, 11013-7045, P822858, M131803, M144098, AF25552. C. FILTERATION PERFORMANCE: This air filter is designed with low flow resistance and composed of a high-density, multi-fiber medium. It has a dirt keeping capacity and can collect airborne particles effectively. D. OTHER DETAILS: Color: As shown; Material: Plastic. Package Contents: 2 x outer air filter, 2 x inner air filter, 1 x filter. Only the above package content is included; other products are not. Note: Light reflection and different displays may cause the color of the item in the picture to differ slightly from the real thing. The measurement allowed error is +/- 1-3cm.