High Caliper Smart Pot Tray Liner 4ftx4ftx12in High Caliper Smart Pot Tray Liner 4ftx4ftx12in Gardeners can see all the benefits of growing with a Smart Pot even if they grow in trays Plant roots also benefit from their natural tendency to grow into soft surfaces like the Smart Pot Tray Liner, becoming thick and healthy instead of circling the inside of the pot and becoming root bound This product is made in China