At C4 Hydroponics we know a rolling tray is very similar to a cafeteria tray that holds all your food in place, except it is for your smoking and rolling accessories. The idea behind the weed tray is that it has one flat surface and is typically much more decorative. Herbal trays have sunken in surfaces and raised edges so that you will be able to have a flat surface when you are rolling.
This helps so that you can catch any herbs that may come out during the grinding or rolling process. While custom rolling trays may vary in size and shape, they are typically rectangular in nature.