The Kuretake Gansai Tambi comes in different box sets. These are cardboard boxes and they are usually sold with full pans inside. The boxes come with 12, 18, 24, 36 and 72 colours. Individual pans are sold separately but can be difficult to find.
I had mine shipped over from Japan and I got the 18 pan box set. I also got some water brushes from Pentel to use with this. The colours are strong and highly pigmented and in turn make for beautiful pretty pictures. Great for Hobonichi paper. Sits on my desk alongside my Liberty of London stationery and Hobonichi 2017 planner.