Alchemy Finally Arrives!Monteverde USA has been bringing new technologies to the writing instrument industry for over 25 years. From Liquid Inks to InkBall pens, they never fail to impress. Now, theyve introduced the holy grail of inks.Imagine writing in Blue and then highlighting that with a clear formula and it changes to Neon Yellow! Or eight other Color Changing choices. Fill one pens converter with your Color Changing ink and the other pens converter with the Changer. Write your message and then go over it with the Changer. The creative writing opportunities are boundless. Only what you can imagine.Overall Size 2.44 in. x 1.37 in. (62.2mm x 35mm)Weight 150 gVolume 30mlTHIS WORKS ONLY WITH THE MONTEVERDE COLOR CHANGING INK BOTTLES