The TRANSFORMER 250 ml refill is not just a simple refill … it's a secret weapon. Just like all TRANSFORMER markers and bodies it is NOW equipped with the standard TRANSFORMER screw-thread. All you have to do is insert the TRANSFORMER pump-valve and screw on an X-change head of your choice and with in seconds you have a real monster marker, e.g. equiped with the TRANSFORMER 50mm Head! The 250 ml TRANSFORMER refill is available in 3 colors.