ARK's Weighted Tip for Z-VibeARK's Weighted Tip is a tip attachment for ARK's Z Vibe. Simply twist a Weighted Tip into one end of the handle and either a Pen, Pencil, or Crayon Tip into the other to create the ultimate sensory writing tool. At just over an ounce, the added weight helps stabilize the hand, increase concentration, normalize writing speed, increase hand strength and dexterity, improve handwriting legibility, and decrease the grip force used to hold a pen pencil. The