GENUINE PARTS ARE A MUST! This is a Shark Genuine OEM replacement part. Part Number XFF350. Always make sure to only use genuine OEM replacement parts to ensure the best performance of your Shark vacuum and to protect the warranty. SHARK QUALITY PARTS Replacement filters for your Shark vacuum. Includes one foam filter and one felt filter. CHECK YOUR MODEL NUMBER! Many Shark replacement parts for different models look the same. Make sure to match the model number on your Shark vacuum with one of the following before purchasing! Compatible model numbers: NV35/199/355/356/360/375 & LiftawayUV540