[4 Pieces Replacement Kit for NutriBullet 900w ]-- The upgrade replacement kit contains 2x Black Rubber Gear.Perfect replacement kit for your everyday need for nutrition extraction [Fit For]-- Compatible with the NutriBullet 600W and Nutribullet Pro 900 High-Speed Blender/Mixer System NB-101B NB-101S NB-201 or Flat Milling Blade.NOT FIT for NutriBullet Lean, RX or Ninja Blenders Please kindly check the models carefully before order [Premium Qualiy]-- Black gear and motor top base gear are made of plastic.These blender replacement parts for Nutribullet blender are safe and durable for long time use [Easy to Install and Replace]-- The extractor Replacement parts are suggested to replace every 6 months or as needed for optimal performance.You can replace the original parts with the new replacement one by one and no other tools are needed during the process, saving time and making life more convenient Package Contents:2 x Motor Top Base Gear2 x Black Rubber Gear