Original Schmincke College watercolor 48 colors watercolor split 0.5ml / 1ml / 2ml Drawing Aguarela professional art supplies0. 5ml grid size is 15X11X5mm 1ml grid size is 19X16X5mm 2ml grid size is 19X16X10mm The watercolor is squeezed out from the original tube, the heating and drying process will produce bubbles and dry shrinkage, this is a normal phenomenon, does not affect the use. Special attention: the watercolor will dry and shrink after drying, it will be sunken, not full