This set includes 4 of the new XL Tetrafans for a slight discount! Tetrafans are finally the size that everyone has been waiting for! Measuring just over 19" (49cm) from tip to tip, the XL Tetrafan is now the size of standard tech fans - but only half the weight! The XL Tetrafan is a lightweight, semi-flexible, 3D printed flow fan, great for spinning and making a wide variety of different shapes. The original Tetrafan was found hiding inside of a 4D cube, also known as a Tesseract, or Tetracube. This gives it a variety of interesting properties. First, it's perfectly balanced in every direction. This means it feels amazing to spin, but it also opens up a variety of balance tricks. They're also great for stacking together! It also creates a wide variety of different shapes that are not available with traditional tech fans. Where Tetrafans truly shine is in their multi-fan capabilities. Each unique shape created by 2 Tetrafans can be used as a base grip for 4 fan exploration!