Combine our Pen Tip Set and Bite n'Chew Tips with the Double Z-Vibe™ and you get the Tran-Quille pen, a great way to work on writing
skills. The soothing vibrations are felt in the hand, but do not affect the actual writing! The "chewable" eraser end is fun to chew on and can be
replaced easily with another tip. Note: this product uses a special battery that can be found under item 461) above --buy a spare! Also, this is
not to be used with children under the age of 12 without supervision.