[ATTENTION]: The nubs on the bottom that engage with the motor is "6 fins". Diameter of the blade base: 4 inch, and this blade is Only fit for Ninja 18oz, 24oz, 32oz Cup. (Not fit 16oz). [COMPATIBLE WITH]: Fits for Nutri Ninja Pro Auto-iQ [PREMIUM QUALITY]: Made of food grade PP and stainless steel, effortlessly pulverizes fruits, vegetables, superfoods, ice and protein shakes into a delicious, smooth texture. The replacement blade has been well-tested by the manufacturer. [EASY TO USE]: Our gasket is installed already in this replacement blade, simply attaches to Extractor Blades included with your blender. Pls note that the gasket may be loose during transportation. Pls check it before use and make sure it is put tight into the replacement bottom blade. Dishwasher safe, easy to clean. Color: black + silver Material: plastic+stainless steel Package Contents:1 x Blender Blade 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.