Rolling a joint is easier than ever with this rolling tray. We added a mold in the middle to lay down your product. And did you know that every tray is unique? Just like our ECO grinders, they are made from recycled plastic cases that are used in the Dutch cannabis industry. Rolling a joint is easier than ever with this rolling tray. We added a mold in the middle to lay down your product. And did you know that every tray is unique? Just like our ECO grinders, they are made from recycled plastic cases that are used in the Dutch cannabis industry.