Attach one of the 4 colored pen tops to the z-vibe for a fun “wake up your hand" writing adventure. Paired on the Double Z-Vibe with a Bite & Chew Tip, you have the perfect sensory combination of vibration and heavy oral work. Great for helping to maintain focus and sensory stability. Use with or without vibration. The Z-Vibe can also be fitted with most pencil grips for better hand/finger positioning.