The Border Concepts Coconut Liner Roll for window boxes are preformed for easy installation and eliminate the need for cutting. These coco liners for window boxes care specifically designed to fit your individual needs. All natural and held together by a tree sap adhesive, unlike other coir liners that use an oil based synthetic glue, this liner has a multiple season life expectancy. * Preformed lines eliminate the need for cutting * Features ecological tree sap adhesive for stability * Multiple season life expectancy * Available in your choice of size