Check the listing for details. SpaceX Starship Pen With Launch Tower. Condition: New. Listed at 16.99 USD. SpaceX Starship Pen With Launch Tower Starship and booster can be separated to allow more fun or to replace ink cartridge Tower is capable of turning as well as is hidden storage for spare ink cartridge Multiple colors for ink are available upon request. Since current iteration uses a gel pen it may have difficulties writing if left on display stand for long periods of time. I've done tests for a few days and was still able to write Since this is a product I developed there may be some tweaks and changes with future iterations especially based on customer responses and reviews Again currently it uses a G2 gel pen refill cartridge so you can refill the pen, replace the cartridge, so that way the pen is not useless when it is empty The pen is more comfortable to write with then it may first appear even though the flaps and grid fins are in awkward looking places they do not seem to interfere or become painful to write with