The tray is a great place to hold all your tools and supplies. You can also roll on it too. If you spill a bit, no worries, pour out the bottom of the tray. The dab station is a great place to hold tools and bowls. Love these items! Ever think of adding more colors to your inventory? Unfortunately, there are lots more things the world needs to be aware of. Every cancer has a different color, match the papers to promote awareness of each cancer. Ovarian cancer, leukemia, Mylodisplastic syndrome [MDS), prostrate cancer, just to name a few. Think of all the colors. :)