Please confirm it is 5 fins and 3.15in/8.5cm diameter before purchase. Measure the base fins number and size of the original blade. This 5-fins blade is compatible with Ninja BL models: QB3000, QB3000SSW-30, QB3000QR-30, QB3001SS-30, QB3000QBK, QB3004, QB3005. Not compatible with 7 fins, 6 fins, or models starting with BL2, BL4, BL6, BL7, BL8, BN, NJ, NN, CT, QB. Tips: 1. Do not overfill. To avoid overflow, do not exceed the "maximum" fill line. 2. Do not run the bl for more than 4 minutes continuously to prevent overheating. 3. It is recommended to replace the blade every 6 months depending on usage frequency. 4. Check if the bottom gear is loose before use and tighten if necessary. 5. Ensure the rubber gasket is properly attached to the bottom of the blade to prevent leakage. Note: This replacement blade is not an original manufacturer product. The design and construction meet original specifications and perform at a comparable level. Mention of brand names is for compatibility purposes only. Product Specifications: Item Type: 5 Fins Pro Extractor Blade Assembly for Nutri Ninja BL Blade Size: 3.15 in (Diameter) x 3.1 in (Overall Height) Blade Weight: 0.88 lb (for 2 pcs) Blade Shape: Cross Blade Color: Black Material: Plastic + Stainless Steel Package Contents: 1 x Base 3 x Sealing Ring 1 x Cleaning Brush (Random Color) Note: Other items not included. Lighting and display differences may cause slight color variation between image and actual item. Measurement error allowed within +/- 1-3 cm.