AOOKMIYA Sennelier Professional Watercolor Paint 24color Set Handmade 1ml/2ml with Metal Palette Box for Artists, Students AOOKMIYA.COM1. Handmade watercolor is extruded from 100% original pipes and fixed in an iron box after heating and drying. We will add it twice during this process, and there will be shrinkage and cracking after heating. 2. The size of a 1ml = 19X16X5mm,2ml=19X16X10mm 3. We will provide corresponding color cards for each box of handmade watercolor to better distinguish colors