Please confirm it is 5 Fins and 3.15in/8.5CM diameter before purchase. Please measure the base fins number and size of the original blade. Replaceable Model: The 5 Fins blender blade fits Ninja blender models: QB3000, QB3000SSW-30, QB3000QR-30, QB3001SS-30, QB3000QBK, QB3004, QB3005. Not Compatible: 7 Pins/Fins, 6 Pins/Fins. If your blender model starts with Bl2, Bl4, Bl6, Bl7, BL8, BN, NN, CT, QB, this blade is not compatible with your blender. Tips: 1. Don't overfill! To avoid overflow, do not add ingredients that exceed the "maximum" fill line. 2. Do not run the blender for more than 4 minutes at a time to avoid overheating. 3. Warm reminder that your Ninja blender blade is best to be replaced every 6 months. (Specific according to your frequency of use) 4. Please check whether the bottom gear is loose before use. If it is loose, please tighten it. 5. Make sure the rubber gasket is attached to the bottom blade to avoid leakage. Statement: The 5 fins blender blades replacement part we sell is a product. The design and production conform to the original standard. Its function can reach the original level. The mentioned above are only used to prove compatibility. Product: Item Type: 5 Fins Pro Extractor Blade Assembly for blender Blade Size: 3.15 in (Diameter) x 3.1 in (Overall height) Blade Weight: 0.88lb (2PCS) Blade Shape: Blade Color: Black Material: Plastic + Stainless Steel Package Contents: 1 x Base 3 x Sealing Ring 1 x Cleaning Brush (random color, do not accept designation) Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture to be a little different from the real thing. The measurement allowed error is +/- 1-3cm.