★ Ninja Blade Replacement 6 Fins - 3.94"/10cm diameter, effortlessly Pulverizes Fruits, Vegetables, Superfoods and Protein Shakes into a Delicious, Smooth Texture. ★ COMPATIBILITY - 6 fins ONLY Nutri Ninja Pro BL450-70 BL451-70 BL454-70 BL455-70 ★ MATERIAL - Made of Food Grade BPA Free Plastic and Stainless Steel. ★ NOTE - The replacement rubber gasket in bottom blade maybe loosened during transportation. Before using the bottom blade, please check the rubber gasket and be sure it is put snugly into the bottom blade. Also please sure your blader uses 6 fins. ★ CAREFUL - Be careful of the sharp blade when open your package. Please TAKE OFF the PRE-INSTALLED GASKET in the bottom blade before using the replacement gasket.