Upgrade your standard base NutriBullet RX 1700W Blender bearings to our High Speed Stainless Steel Rubber Sealed Precision bearings for longer life and improved durability. Rated at 38,700 RPM with Red PTFE Heat Resistant Rubber Seal. Please note that if the seal is damaged, this will cause leakage into the bearings which will cause corrosion and premature failure, please check the condition of the seal.