A mouthpiece is a necessary part of a vaporizer, after all, you cannot call a vaporizer a vaporizer if there is no mouthpiece. The mouthpiece is constantly used, making its lifetime considerably shorter than other components. Also, if you want to share your vaporizer with your friends, an extra mouthpiece is essential for hygiene and cleanliness. This set includes four mouthpieces at an affordable price point. If you have allergies, then the mouthpiece helps you avoid allergic reactions. These mouthpieces work with any Mighty or Crafty Vaporizer.