high-quality plastic for gears. These parts ensure strong sealing and long service life, easily installing without tools to revive your blender's performance, extending its lifespan and saving costs. Compatible with Nutribullet 600w, Pro 900 (NB-101B, NB-101S, NB-201, flat milling blade), they *do not* fit RX (1700w), Lean (1200w), Baby Bullet, or Nutri Ninja models—check your blender's model first.